Why hate ap mids?

Why Riot hates ap mids? After few games it feels like they are totally useless. Keystones for AP are not that good, mana pots removed, m.resist items buffed, ap items cost higher. That feels just sad. Anyone same thoughts? Last season I mained control mages (lissandra,viktor) and now they feel shitty compared to yas/zed for example.
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