As I said, just install the free program Teracopy and that will prevent you accidentally moving files. Microsoft are obviously not interested in providing a solution, so you're just wasting your time asking them.
Examining this issue from a broader perspective ... I also encounter the same accidental drag & drop issue
outside of Windows Explorer (eg. in the Bookmarks folder of browsers). I don't suppose Teracopy would help in such cases ?
In my situation, I generally start running into the said issue when the mouse has undergone a few months of usage. My temporary workaround to mitigate the impact is to increase the default values (to 40) for the
DragWidth & DragHeight keys in Windows Registry (so as to lessen the Drag Sensitivity).
However, I still manage to encounter accidental drag & drop. Perhaps my hand is not steady enough. I suppose the impact could be more severe for elderly users & those with neurodevelopmental/ hand tremor disabilities.
While the solution for certain users might be to procure a new mouse regularly, perhaps there could instead be a
mouse-related utility to prevent accidental drag AND accidental double-click
everywhere & not just within Windows Explorer. To my knowledge, a utility already exists to prevent accidental mouse double-click.
Well, just a suggestion for the developers out there seeking a universal solution ...