> SPARC stopped being ahead of its time way before being bought by Oracle.
You seem to be focusing strictly on performance, but there were other factors: e.g., remote management is still a bit of a mess with x86. With SPARC everything can be done on the CLI (serials consoles or SSH), with x86 quite often you're still clicking on "open KVM window" for so many things. And of course many/most vendors make you purchase an 'advanced license' to use the remote KVM functionality of the LOM system.
Just like the vast majority of buyers do. SPARC was abandoned by customers due to poor performance.
> but there were other factors: e.g., remote management is still a bit of a mess with x86
That's a property of the systems integrator, not the ISA. Dell's iDRAC works quite well.