Azerite is better than tier in every possible way.
Vendor gear was locked in it's stat combinations and you were either lucky, or you werent'. Scaling itemlevel m+ rewards allow you to always get your BeSt iN slOt every content patch. Just do the dungeons.
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Mentality is 100% correct. however the good thing is that outside of the odd case of the crit/versa ring, you can get several items with the same stats on them.