Either it's a misconfiguration, or it's intentional (only providing a "bare-bones" machine for the lowest price level, even if the underlying hardware would support more)?
Isn't there a thermal cost to AVX instructions? Or, thinking of other reasons, if you're splitting up physical hardware into a "vCPU", it it possible that AVX doesn't map cleanly?
Isn't there a thermal cost to AVX instructions? Or, thinking of other reasons, if you're splitting up physical hardware into a "vCPU", it it possible that AVX doesn't map cleanly?