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Drag and drop is also quite extensively supported in more contemporary operating systems, you know... One can easily do many file operations with it in Windows, and at the very least dragging of files to applications works universally.
Thing is, hardly anybody does it. Perhaps it's just not such a good idea, with mouse - requires few highly coordinated separate actions which, if accidentally interrupted ("dropping" the icon while moving it, for example), give unpredictable results (who knows where it was dropped this time)
And if you really want it, there are less complex Windows gfx applications than those from Adobe.
Yeah, Ruby or Python are a lousy comparison - 2 decades ago they were in their cradle, not really practical but with concepts aiming for the future, and steadily expanding from there (not "resurgence"). RISC OS was in its prime time, with tech and approaches of the (then!) distant past, and declining.
The approaches which gave RISC OS its relative niceness (in its time), or snappiness, also meant it never did that much, and they severely limited its progress. Yeah, it was "much harder to break in the classroom" being contained in read-only ROM - which, again, limited the possibilities. And is something a limited account on modern OS does just as well... (but do you really want to, in educational setting? Perhaps it's better to allow for breakage, and in the worst case just restoring working state from image)
RISC OS has its place - as nostalgic toy or a hobby OS.