you're naturally biased toward it because you "draw in that style" and have been "studying" it (why? there are so many better, underused styles out there). as you correctly pointed out, it looks every bit as generic, sterile and run of the mill as it gets.
I studied design and illustration, in that I made my bachelor degree. I design/draw/paint in a variety of styles. I just privately prefer to consume games, comics and animation in manga/anime style and I privately draw in a manga/anime-inspired style. It's pretty different to the Honkai anime style though. Way less cute and pretty and less standardized.
You understood me partly wrong and you are partly wrong in your assessment of the quality of Honkai impact's art. Yes, this particular kind of anime style is used like a million times in other games, anime and manga. Also the character designs are reminiscent of designs we've seen a million times in other places.
However, and I guess you will only be able to see that if you are a professional artist yourself and if you are also familar with the professional game/manga/anime scene, the art of Mihoyo is still of higher quality than in most other games, manga and anime. I could now in detail explain to you why for example the hair, fabric folds and their shading are masterfully done. Or why the character proptions and perspectives are so on point, that you sometimes would guess they actually are 3D models. They sometimes are, Mihoyo does also do 2D art and animation that uses 3D models, but the examples I showcased are mainly 2D art.
(Mihoyo being able to create CGI anime art and animation so well and convincingly is in itself a great feat, because there are worldwide only very few animation studios that actually are able to pull this off as well. There are so many high budget CGI animes out there that look like absolute garbage!)
Being able to draw like that is an amazing feat for a regular 2D artist, they have the sensibilities of a sculptor or a 3D computer program.
Another anime style artist that is famed for the exact same thing is Shinkiro, a veteran Capcom character designer and illustrator. He is able to draw and shade as if his art is done completely in a 3D program. Maybe because his style his way less cute and common you'll be able to notice more of a quality here:
It is not about the style and character design and how overused and cliché they are, it is mainly about the technique and skill and that's of high quality in much of Honkai Impact's art and that of Shinkiro. One also has to remember that these artworks are churned out in a very fast fashion. To keep as high quality and polish is pretty awesome.