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macOS Tahoe doesn't do this anymore though

That’s not correct. I have Tahoe beta 2 on one of my test drives. Monitor behavior is the same as earlier macOS.

My M2 Ultra Studio has the Apple Studio Display (Main) connected via TB4 plus two LG 4K displays—one connected to the HDMI port; the other connected via a USB-C to HDMI cable.


BIAB 2025 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia, M1 MBAir, 2012 MBP
Digital Performer11, LogicPro, Finale27/Dorico/Encore/SmartScorePro64/Notion6 /Overture5