> But yes, register count is still a thing. Why? If you run out of registers, operations 'spill out' into main memory. Read: L1 (data) cache. Which is fast, but not as fast as CPU registers. And probably uses a lot more transistors & power.

Yes, register renaming. What I mean is that why does anyone care still what instruction I am running on? The CPU have its own microops, instruction decoder, its own pipeline, scheduler, etc etc

Why can't you have a CPU that have 1024 registers and pretend that it only have 32?