The Whole AVX1, AVX2, AVX4, …, AVX8192 means the SIMD instructions will only get used by missile labs. Since you have to recompile all your code to use them and because end users will have old machines, devs will either stick to something 10 years old or just skip them entirely.

It is self-defeating for Intel because their greatest competition is not AMD or ARM but sticking with the CPU you already have. Hypothetically SIMD is the major source of performance improvement in new generations but if the software doesn’t support it, it might as well not exist, so why upgrade? If users don’t upgrade why should devs use the new SIMD instructions.

Try to tell them this common sense and it is just ‘talk to the hand’.