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I dread upgrading my 2020 iMac, because the screen is still gorgeous, but there's no way to use the screen as a secondary monitor (or is there?).

I find the Studio Display to be 2X what I'd be willing to pay for a monitor—for me the Thunderbolt Display was the best: reasonable price and great quality.

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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.

You should be able to use it as an external monitor by enabling Target Display Mode. https://support.apple.com/en-us/HT204592#:~:text=You%20can%2....

Edit: looks like this is no longer a thing.

From TFA

> Target display mode is a feature available with certain older Mac models.

TFA talks about how that doesn't exist anymore.

yeah, that hasn't been a thing for 10 years now, unfortunately.

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