Yeah you're right, there are some things like that in older FEs, but it didn't feel like it was always the case or the supports are also revolved around both characters gimmicks*
I'd say they're just a bit more exaggerated. I get the annoyance with them, some of them are super silly. Fates had some real dumb ones. That said, a lot of older support convos are dry as hell.
This line, though:
Tanith: I may be a fine warrior, but... It's embarrassing to admit, but I can't even crack an egg without hurting someone. The last meal I prepared at the academy took three of our finest generals out of action for nearly a month.
lol.