Agree completely this is beyond silly (although far from the most ridiculous constraint or missing feature on Canvas).
A workaround suggestion, in case helpful to others: Because question numbers in Question Banks appear to be read as text, it can be helpful to number them in that fashion, using e.g. 3 or 4 digits for each question number, simultaneously leaving large gaps every so often, in which additional questions can be inserted or moved around, e.g. numbering the first 12 questions: 100, 101, 102, 110, 121, 122, 130, 131, 132, 140, 141, 142; this way 7 open slots are available between each set of 3 questions and there are 100 open spots at the beginning – 000, 001, 002. (Or some variation on this, e.g. 100, 101, 102, 200, 201, ..., or 0100, 0101, 0102, 0200, 0201, ...). Hope this might be helpful at least until Canvas starts being able to actually ACT on good suggestions instead of relegating them to far flung 'voting' opportunities ...
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