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Wow, I literally had not noticed the change in Dock behavior... it would sometimes pop over to a different display, which ALWAYS irritated me. But it hasn't done it since upgrading... and now I see why!

For me, this is AWESOME.

But, I do understand that some workflows "Relied" on the old method, so yeah - should be a toggle in settings. "Old" method or "Good" method ;) <jk>
 
I hope in 15.1 windows still resize automatically when the dock is summoned to another display. That was the most annoying part prior to Sequoia.
 
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