Not it is not fine at all. If you have too many instructions but not enough, your whole CPU will run slower mostly on non AVX-512 instructions, and maybe even y

Not it is not fine at all. If you have too many instructions but not enough, your whole CPU will run slower mostly on non AVX-512 instructions, and maybe even your whole package => the end result will just be slower. Not to say that those processors are bad, but AVX-512 on them is for niche workloads.