So, let's talk about Nier Replicant next!
(It's even simpler in terms of gameplay.)
I wouldn't really recommend the Nier games to someone looking for mechanical depth. They're 99% about the world building, the plot/story, characters, underlying motifs and themes; the combat merely is a tool for these other aspects, and it definitely shows, even if Automata was a big step up over Replicant already.
I'd go as far as saying that every single gameplay mechanic in both Automata and Replicant is at least solid to good in its implementation, but that they basically stop there and never go beyond this base level. Which is fine, given what these games are going for, but obviously might make some people lose interest. There are many, many games out there that outshine Nier in terms of pure mechanical complexity and interaction, though, with regards to basically every single mechanic there is (action combat, hacking, shmup sections, puzzles [if you want to call them such], etc.)