Is ZZZ Worth It? (Mainly for Those Who Played ZZZ Too)

I'm thinking about quitting HSR, one of the main reasons is because of that VORACITY CORROSION. I genuinely thought it'll stop after the next patch because this corrosion thingy is related to this patch's story. But guess what? >!Leaks about the Level 3 of the corrosion is everywhere (like the corrosion itself spreading everywhere lol).!< And also I wanted to invest in Acheron and Phainon's team first (I quitted in 4.1 and came back at the second phase of 4.3 so I didn't get MBlade) because people say vertical investment is better and I haven't pulled for Elation yet even though I want to get SW999. But it's just Elation shill + the usual HP inflation + even bigger HP inflation (the corrosion) nowadays, and I can't properly clear content while I'm trying to vertically invest.

These are the main questions I want to ask, and please give extra information about ZZZ if there's anything I'm missing.

1. Are there difficulties in clearing endgame? If no, how easy it is to get the max score?

2. Is there bad powercreeping?

3. Enemy HP inflation?

4. Is it easy to grind for polychromes?

P.S. I don't know if I should post this on HSR or ZZZ subreddit, so I'm posting this on both.