It's indeed way too easy once you get the top tier hacks. You can wipe entire areas without them even acknowledging your presence. It's missing opposition netrunners who would block you and/or fry your brains should you be not careful enough, and maybe set up ICE or something (where are they ?). It's a whole missing part of the game really...tried stealth hacker and it seems too easy.
I can wipe out everything without going in.
That's why I went out of my comfort zone with the Cyber Samurai and had a lot of fun with it. Max difficulty then presents a mild challenge (still too easy to my taste, but YMMV there, Dark Souls was not too hard for me too), at least you have to stay alert and keep a good situational awareness.