Twilight Sparkle: Ah. Well... Hmm. This is a lot harder than I thought – and I didn't think it'd be easy. Is it supposed to rhyme? Fit the meter? Will failing to match the pattern weaken the final spell?
DM: Short answer: No, it's not going to be that strict.
Applejack: An' the longer answer?
DM: Well... This actually touches on some of my "headcanon" when it comes to verbal and somatic components of spells. It's not a well-known aspect in the universe of this setting, but it's relevant. See, casting is mostly about willpower and focus. Incantations, rhymes, grand gestures, even mathematical symbols all help the wizard focus. So in ancient magic, you'll see a lot more poetry and choreography, but in more modern magical practice–
Rainbow Dash: Kiiinda losing the plot there, buddy.
DM: Oh, right. Well, you asked for the longer answer.
Applejack: Figured it wouldn't take much to get you rollin'.
DM: Tell you what, is now a good time for a food break?
Twilight Sparkle: Yeah, I'm going to need the extra brainstorming time.
Pinkie Pie: Ooh, ooh! Lemme help!
As has been clearly shown before, I'm not above using delaying tactics to give myself, the author, more time to figure out how I'm going to handle a much more specific and artful piece of prose.
Whoa whoa whoa, you can't just stop there! In more modern magic practice, what? That's fascinating info, I love in depth systems of magic!
If I had to guess, I would say modern day incantations are shorter, maybe more catchphrases to jog the memory and create word/spell associations? This would probably work better when it comes to casting spells faster, since there's less buildup time, but it also may weaken spells by making them simpler and do less stuff. So, older spells in that case would generally be more complex, maybe more often be an amalgamation of lots of different spells in one incantation, taking more focus and time to cast while also doing more things once the spell is cast.
Filling in the blanks, it sounds like the modern style is for simpler incantations, which probably makes spells easier to learn in some ways (less to memorize) but harder to learn in others (it's easier to associate a certain state of mind with a song than with a simple phrase), but wouldn't ultimately affect their power at all. Incantations are just a tool to achieve focus, after all, not things that are necessary in and of themselves.
"In more modern magical practice, instead of focusing on memorizing the incantations and gestures of spells, the emphasis of high-level magical education is on training the student's overall mental focus and willpower. Mental visualization techniques, honing concentration, increasing channeling stamina. Things that are proven to make casting all manner of spells easier."
The hard part is picking just the right episode for the scene of Spike holding a checklist.
Anyway, I once had a bard that cast spells via interpretive dance rather than singing. Which the group was all for once I assured them tap shoes were not likely to be involved. You can make more noise with slam dancing anyways.
There are some that love to listen to headcanon, past Lore, and everything the mod does... And others that are very impatient and want to go to "I slash X monster" and we can guess that many GM had many like them...
You might be zeroing in on the word "focus" more than I really meant. There are multiple kinds of mental strength besides sheer focus, and I think they would all apply here.
Though yes, now that you mention it, I can imagine there being some kind of magical stimulants market, but for the sake of my own worldbuilding work I'm not going to apply it here.
You do know that ADHD can be co-morbid with autism, right? I have both ADHD and Asperger's. Sometimes I'm easily sidetracked, other times I hyperfocus and forget to eat.
Oh man, you must be driving your psychiatrist up a tree then, lol. What with the mainstay of ADHD treatment being stimulants but having to titrate that dose to avoid hyperfocusing and forgetting to eat!
It strikes me that this sort of extra detail might be EXACTLY the sort of background knowledge of the magic system which might be useful for Twilight's player. For instance, if an old-style magical incantation was incomplete, perhaps the issue was that the incantation COULDN'T be finished in the ancient style, and what she needs to do is to identify the important elements and convert them into the more modern style in order to formulate the sort of spell that Twilight would use. A detailed discussion of details of the magical system that Twilight would know but Twilight's player doesn't might be very useful.
But then, it could be a discussion to have over food while the players that AREN'T interested can do something else.
I'd guess the long version to essentially boil down to, "The magic comes entirely from the caster. The spell itself is more or less a mnemonic device to put them in the right mental state to cast it. So, in modern times, spells tend to be more logic-based and formulaic, to match the worldview of the caster." (And old magic is more difficult to cast, because it requires adopting an archaic mindset to be in tune with the spell.)