Steam client drops support on macOS, but adds it on Linux
Briefly

The latest update on the Steam client mentions several improvements for Linux users - but it also links to an end of support announcement for users on macOS 10.13 and 10.14. Those releases aren't supported any more, and that marks the end of the line for 32-bit games on Intel Macs.
MacOS Mojave was the last version to support 32-bit applications on Intel Macs. Catalina (macOS 10.15) and later versions will only run 64-bit code. So while updating to a newer macOS version is an option for users of slightly newer Macs - such as this vulture's 2015 iMac - and you can then get newer releases of the Steam client, that means losing all your 32-bit apps. And while this writer is not much of a gamer, we are told that a lot of games are still 32-bit and won't be updated.
Read at Theregister
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