The most ridiculous missing feature is there’s no refresh button for the current folder. Sometimes to show new files created by an external process I have to relaunch the whole finder process just to have my files appear as it caches the stale view
This bites me on fake FAT filesystems over USB for hardware development kits, and I usually just turn those features off. The heuristics there are often terrible, and I'd rather create a build system that writes a new image, instead of doing manual drag-and-drops.