Not judging or defending them but 3 ground rules for any software:
1- just because something works in alpha or beta doesn’t mean would be available on launch, the beta was stress multiplayer test, the alpha test was single player test. Wasn’t intended to gauge any hardware itself or had all functions of the launch game. Their purpose weren’t narrow software because the logic was smaller to address what they wanted to check, which was server stability which btw, done a poor job.
2- having older Hardware when you compare with minimum requirements you are subject to have a problems. Like driver features, direct x limitations, cpu features and OS limitations.
3- having almost 11 year old Hardware doesn’t help your case, their requirements are 9 and almost 10 year old hardware. Both cpus and gpus supported were released at 2012.
About AVX issue, they plan to remove if not breaks anything that’s why they’re further testing, check the post from pezradar about it.
Continuing the discussion from [Advanced Vector Extensions Issue Update - 9.27](https://us.forums.blizzard.com/en/d2r/t/advanced-vector-extensions-issue-update-927/12557):
Most folks right now have Hardware capable of running any AVX instruction. On steam by example have 5.3% users being unable to use it, across 3 plataforms(windows, Linux and macOS) and this number keep decreasing each year/month.
They probably will remove the requirement but most likely will take time, to address caveats that could come from it, if you’re not sure if you can wait until then, you can ask for refund and buy later.