I just don't understand why they would possibly take away this fundamental and crucial OS behavior.
It's not necessarily fundamental and crucial.
You may be surprised to find that many users, like myself, rarely, if ever, use icon view. Instead, I use Details or List view and know where everything is based on the folder it's in and/or its order (usually by name, but sometimes by some other attribute). Sometimes I use icon view for folders containing pictures, but still leave them sorted by name, date, or type.
Microsoft may have determined that very few users were interested in arranging icons manually, other than on the Desktop. When I search the topic, I get many hits on arranging Desktop icons, but next to nothing in regards to arranging icons within folders. It never appeared to be a hot topic. It's obviously super important to you. It just doesn't appear to be important to a lot of other users.
I don't understand why Greg Carmack gave you so many links when everything relevant is covered in this tutorial which clearly states (and you've confirmed this yourself) that it no longer works as of Windows 10 Creators Updateversion1703.
As of Windows 10 1703, the functionality (of icon positions in folders being remembered) has been stripped out of File Explorer. You won't find some registry "hack" to bring back that functionality and, as far as I can determine, there are no third party utilities to provide that feature. There are many tools that enhance Desktop icon position management, but nothing it seems, for icon positions within folders.
At this point, your choices appear to be:
- Learn to live without that feature (e.g. readjust your file organization to use more folders).
- Install a version of Windows 10 older than 1703, set it to not auto-update, and accept that it will be less secure.
- Give up on Windows and get a Mac.