The approach described there is significantly different from Zig's approach, which doesn't use MTE and quarantines forever. Note that Chromium never seriously considered quarantining forever as Zig does because leaking every allocation less than 4kB unless all allocations in that page are freed is not production viable.
True, but I don't think Zig is committed to that particular idea and nothing else.
Yeah, quarantining forever is going to have much more memory overhead. It might be fine for some use cases, but not a browser or anything else complex + long-running, I agree.
In most cases that's true, but not all. ARM MTE + quarantine has just 1-2% overhead as tested on Chrome:
https://security.googleblog.com/2022/05/retrofitting-tempora...
Perhaps we'll see such techniques used in newer languages like Zig.
(This doesn't detract from your main point, of course - yes, Zig is simpler because it has less safety.)