I consider twist shifters "consumables", I actually keep a set of 3 X 7 and 3 X 8 twist shifters and an 8 speed Tourney RD on hand because at least once a year somebody brings their old box store MTB or hybrid to me because it won't shift any more. My own twist shift bikes got switched to trigger shifters a long time ago.
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".....distasteful and easily triggered."