Hi Nikola,
I agree - 3D-LUTS and PROOF are only poor workarounds.
Adobe needs to come up with a solution for that.
Affinity Photo and Krita are having OCIO support for example.
I am using the Nuke & Photoshop roundtrip with TIFF in ACESCCT & PROOF quite a lot. But mostly
to cleanup plates using heal patches and content aware fill.
This is working fine for me, but I use only 1% of Photoshop.
I found I need to be careful when painting & layering in Photoshop in CCT-LOG space, because a full “white” pixel will be around 222 in scene linear when you are back in Nuke.