TL;DR:
Standard has gotten less fun as players [via Arena] create solved formats at a breakneck pace unseen before in Magic history. Combine that with a shuttering of play due to a pandemic that led to players finding non-rotating formats they could invest in due to uncertainty for when Magic play would return and you get all-time lows in Standard play.
@andrew Why play paper Standard at a shop when you can play Arena Standard in your pajamas? That’s the question in need of an answer.