What happened to the ROTATING game modes?

So unless I'm missing something. Earlier this year, Riot rotates through game modes for a few months (ascention, ARURF, Poro King, etc.). Then they stop for a month for... some reason. They then fail miserably at Clash. Rotating game modes stop altogether months. Now nexus blitz is a thing that has been here for a whole week. It's hard to imagine that this is what rotating is supposed to mean.
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