MTE is part of ARMv8.5, a hardware specification. There is no iOS device that ships with this–and I would expect very few (if any?) Android devices do as well. Do you have a source of it being a requirement for ARM-powered Android 11 devices? Because I would expect this to exclude almost every currently shipping device…
It is Oracle with SPARC ADI, Google/ARM/Apple with ARM MTE, Microsoft with Checked C, AT&T with Cyclone that actually bother to change the status quo.