As it happens, the situation was a sufficient downer that I lost some small amount of motivation to keep that character alive, and I made some subtle mistake that Sil players will tend to make when in that mindset, and that character died soon after.
That artefacts are only generated once is imo the main mechanism against stair abuse and 900ft. scumming. Stairs used to take a 100 turns, since they don't anymore it is often a good idea for weakish Edains e.g. to go up and instantly down again (you can't do it several times in a row, but one up and down usually doesn't leads to broken stairs) once you face a too difficult obstacle. However, you have at least to worry about both the initial floor you left and the floor you barely touched containing unique treasures you might have missed. This mechanism also limits the usefulness of the "dive to 900 ft. and repeat 900 / 950 ft. several times" because you won't find artefacts that were generated before. Some tend to be dropped earlier (if it all) and thus are hardly found in the very deep dungeons. As far as I remember (well I can fool myself here), I never found the robe of Aredhel (+3 evasion robe + freedom of movement, which is amazing for certain builds) past 600 ft
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