My situation:
I have a texture folder (pass through) with three layers (one multiply, two normal).
This texture folder is rather large (170 mb, 4k file), and I'm using it in many files, so I want to use a linked smart object, so I can reuse the same psd everywhere, and save space (and sanity during editing).
Problem: once I transform my folder into a smart object the pass through / multiply are gone, and my combined images doesn't look good.
If I could use a pass through blending mode on my smart objects, I think I wouldn't have this problem.
This feature request was also mentioned here in 2018, and the same example image applies. We can't see the building through the blue smart object, because pass-through is unavailable: https://community.adobe.com/t5/photoshop-ecosystem-discussions/smart-objects-need-to-retain-blend-mo...