This is incorrect/more nuanced.
I primarily use Lex Talionis in the modern era and I have deliberately formatted lots of things in the repo to work with it. I also used Tactile for a while and that’s why every animation folder is formatted the way it is; to work with as many engines as possible.
LT can convert map sprites to its format automagically. Some types of map sprites aren’t perfect, especially big ones like wyverns, berserkers, or final bosses, but 90% of them are just fine. Animations you port into LT will also work in Tactile because they use the same format.
Note this topic for map sprites: It’s out of date, but that’s only because I’ve been busy. Still has a ton of LT-style map sprites in it.
For battle animations, you can port those into LT and Tactile the same way you can in GBA. Tactile is more… finicky… but with LT it’s a very simple process.
Spell animations, on the other hand, are a big, big, big fat ‘no’ for now with either engine. They only work in GBA. LT might have a spell animation importer in the future, but it doesn’t currently.
So more realistically, the answer is ‘most things will work fine because I made them work that way in the repo deliberately for my own purposes’ but also a few things are clunky and won’t. For now.