Azir isn't super popular and has also been out for an extremely short amount of time compared to:
(beta)
(I think beta)
(season 2) and
(beta)
Comparing Azir, who was released, what, in season 4? 5? to champs who were released 8 years ago in terms of skin count is a real accurate comparison. [slayer-jinx-wink]
A better comparison would be Yorick, who just got his first skin since his release (season 2) and actually follows somewhat similar of a pattern. Released weak, instantly became broken when everyone figured out a strategy with him, pick or ban, legs broken, in the gutter for 7 years, eventual rework to make him decent again. Except Azir needed less work and got multiple mini updates much earlier.