I also felt the same when I went from Fire Emblem Warriors to WO3.

But I don't think it's a bad thing. Different games from different times. I do prefer a bit more the slower pace from the old games, because it makes the gameplay more meaningful. You're still overpowered, but not that much. You still need to be good to do the more difficult stuff.

But after you get used to it and start using Agility everywhere, you can get to the point that the game feels really fast lol.

By the end of my playthrough, I was already getting bored of having to wait everything develop in the stage. The only thing that could, maybe survive more than a few second and make me stop was Hundun from his stage on the 3rd level of the gauntlet mode

This is why I've been going back to play them in release order. Because yeah, over time despite what is often said, Warriors games get better. (in large part because the spin offs/cash in's give them a safe way to field test mechanics.)