This is why I'm always surprised to see people suddenly realise that the game is a grindfest ... it always has been, lol. It's part of the game's entire DNA. Everything outside of the Story is designed with that feature in mind. Just one step into Co-Op Ex Raids or Events proves this.
The game is in need of a ton of improvement, but they have begun making steps, and hopefully the single-player Villa, the new stat tweaking system, and the Co-Op battle speed and AI tweaks will help with this in the future.
I'm still enjoying it however, specifically because I am pacing myself. I've only completed one EX raid regularly on Very Hard, but I've stuck to that one, improving the drops that I get from it and slowly getting better and improving my units.