Q for all those with suggestions: do any of these attempt to replicate the Spatial Finder? No other system I’ve seen (contemporary to OS 9 or since then) seems to have got this element correct (or even attempted to do so).
It’s such a key part of the OS 9 (and earlier) experience. Double click a folder and it opens where you expect it to, in the shape you left it, with the icons laid out as you left them. It’s a method of working that gives you great familiarity and confidence.
If anyone’s worked in a kitchen or workshop for a long time and developed a deep memory for the layout and the location of every tool, material, and control, then they’ll know what I’m talking about. You can move around and work incredibly efficiently, relying greatly on muscle memory.
Since the demise of OS 9, the only way to retain this level of operation has been to rely heavily on the keyboard. Since almost everything on the screen is transient and unreliably positioned (non-spatial), only the keyboard is persistent enough to allow us to work at the speed of thought and rely on muscle memory. It’s been so long now that I think people forget (or never knew) that the contents of the screen could also be persistent and spatial this way.