I quite like slice of life episodes, perhaps even more so than the adventure ones, but slice of life with well established adult characters as per S2+. I'd quite rather see the adult mane six, say, try to reconnect with their younger siblings a la later season episodes, or a standard day in the life, instead of acting like they don't even know each other.
All opinions are subjective of course but the art quality no one can deny improved as the animators gained more experience.
I woulda liked to see more arcs that didn't involve saving the world from the monster of the week in all honesty but something with more depth than an annual gala dress party at a castle anyone could visit anytime they wished.
Then again, that's probably asking an unfair lot from a kid's show that is perfectly acceptable for its corporate target audience no matter what it did.