Mainly the barrage of "instance hardware degradation" emails that i get whereas on gcp those are just migrated (sometimes with a reboot/crash). Also there is no brownout. I've never used t2/3s which apparently do support migration which would make sense.

After some kinds of hardware failure, it can become impossible to do live migration safely. When a crash can ensure due to a live migration from faulty HW, I'd argue that it's much better to not attempt it.