Honestly, most of the movesets are fine.
I just think that not everyone is going to gell with every character on are 80+ roster. That's why the roster is so vast. Gameplay wise, there's something for everyone. If every new character started getting Shulk or Steve level gimmicks, I'd share the concerns, but we still get simple movesets like Ridley, K.Rool, Banjo, Byleth, and Sora. We have gimmicks that are really easy to understand like Joker, Min Min, Pyra/Mythra and Inkling.
I'd also be concerned if gimmick movesets took over the competitive scene, but they largely haven't. Sure you have your Steve doomposting and DLC characters being kinda nutty, but majority of the top tiers are just average Smash characters like Pikachu, Wolf, Sonic and Roy.
People can have a preference. Instead of tweaking characters to some perfect middle ground (that honestly doesn't exist), I think its healthier to accept that Smash has created a huge array of playstyles, and that both simple and complex characters are valid.