This came up in the comments of this question. The OP asked how to fix one thing and gave an example where the problem arises (vectors with different components have different height). In that example the OP wasn't careful about other things: text in mathmode was not upright, and some braces were not scaled to encompass their contents.
In my answer I concentrated on the question at hand: how to make the vectors have the same length and I ignored the "problems" that the OP's MWE had. some of the comments I got seems to suggest that I should have corrected these issues in my answer (which used the MWE and fixed the relevant part).
What should be our approach? when someone asks about A and has issues B & C in the example, should we fix A, B, and C, or should we answer the question as it is posed? Perhaps we could comment on the original Question with regards to B and C instead of correcting it in the answer? Should we have a unified approach to this?