The inherent appeal of gacha games is always cute anime girls/pretty anime boys. I doubt anyone will find any of these games appealing to them if they don't like the art style in the first place.

I haven't played Honkai or Genshin Impact, so my understanding and knowledge of both games is fairly limited (mostly hearsay from people who actually played them), so take the rest of the message with a healthy dose of salt.

I've heard the production value is excellent compared to most other mobile games: for the low price of $0 (gacha microtransactions excluded, of course) you get a full open world game with nice graphics and animations and a fully fledged story (I'm unsure how good that actually is and from what I've seen I'm inclined to think "not much", but it probably appeals to anime fans).

I've also heard that you can play Genshin Impact for free and still get the characters you want if you're patient enough, which is not something that can be said of most gacha games. The PvE nature of the game means that you don't necessarily need the best lv999 S-rank character to compete with other players, and can enjoy (most of?) what the game has to offer for free, which means that you don't need to engage with the gacha aspect of the game if you don't want to. I don't know if that applies to Honkai as well, but considering it's a very similar game from the same software house, I'd say it's possible.

In conclusion, I don't think the game is worth checking out if you don't like anime and/or mobile games, but if you like any of those and are a young person without a stable income, a f2p open world game with bells and whistles such as nice graphics and animations could be appealing. Although, as I said, my opinion is mostly derived from hearsay and a quick glance at YT to check what the deal was about, I won't pretend I really know what I'm talking about here.