Likewise. I had a feeling of "Ooooo sneaky buggers" which then moved to "grrrr WTF am I meant to be doing here". I persevered due to the spirit of the game being you're exploring this world with little foreknowledge, but RP aside, I got through by sheer stubbornness and frankly felt relieved and stupid in equal measures once I'd got out but little satisfaction. Maybe some small indicators on the walls would help, certainly an end goal to strive for and that is communicated (don't tell me I missed them!). Had feelings of The Witness, Myth and Tomb Raider when in there and then ultimately felt that they're indeed missing quite a few tricks there.
Add some visual guidance on the walls so you can try to map out what's going on or have an upgrade available for the scanner that aids in some small way. Put in some buttons, these should indeed be bonus tombs to raid and not easy to solve but it needs more than one puzzle element. And reward and communicate completion, I'd say there could be a whole additional tier of tech that could gathered and story discovered through these places.