I can't even name one other than an iMac that I would want to use. The whole reason to want to use the older 27" 5k iMac is that it's an incredible display. Better than you can buy, other than the 27" Apple Studio Display.

This video describes one: https://youtu.be/UJrdKKmb9tQ

Recycling electronics basically means crushing them and extracting some of the minerals inside. A lot of them can't really be recovered, and of course all the electricity that was used to create it is still gone and the water used is still tainted.

If you make electronics you should be forced to do everything humanly possible to extend its useful life.

Consumer electronics have a negative recycling value - the raw materials are worth significantly less than the extraction cost (in both financial and carbon terms), making recycling nothing but environmental theatre. If electronics manufacturers actually care about sustainability, they must extend the working life of the product by designing for longevity, repair and reuse.

Apple have a very mixed track record in this respect. iMacs used to work as an external monitor when the in-built computer became obsolete, but that feature has been removed. Most components in an iPhone are locked to that device, preventing their re-use as spare parts. Apple computers are almost entirely non-upgradeable, greatly limiting their potential useful lifespan.

[facepalm]