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by firecall 1024 days ago
There are some solutions, such as Duet Display:

https://www.duetdisplay.com/blog/how-to-use-your-imac-as-a-m...

Apparently you can use a TB cable to connect it up, so it might be reasonably performant as a productivity monitor!

I think you can also extend to some displays using AirPlay, but from memory performance wasn’t great when I tried.