I thought I heard the rumble of goalposts bring shifted.
From the OP and the post you initially replied to which was also the second post:
Core i3-12100F and Core i9-14900KS. That's what the poster you replied to was comparing AS to in the context of a desktop, core i-X desktop processors. Those are desktop class processors and despite the OP's statements, stinksaroundhere is quite correct that Apple's current crop of processors compare very favorably to them (Ryzen as well), both in single threaded and multi-threaded desktop workloads. His "best GPU per watt" remark however is most definitely a shift in goal posts from performance to performance per watt as the AS GPU does not compare favorably with similar desktop GPUs in terms of raw performance like the CPU does. Hence why I responded that your inclusion of a 3995WX "is equally a non sequitur". As an aside, his remark is also not strictly true as Nvidia Max Q GPUs have in fact a similar performance per watt as Apple GPUs (simply measured as TFLOPs, obviously actual performance varies hugely from that). They share remarkably similar design philosophies, but that's another tangent.
Later we began to discuss actual workstation chips and if you want to talk about workstation chips in a more productive manner, then sure the Ultra CPU can be compared in design philosophy to a HEDT/light workstation chip and it also true that Apple does not make anything close to a high end workstation Threadripper 7980X equivalent that could go into the Mac Pro but not the Studio. Since we're going to have to wait for the M4 to get an Ultra, to estimate where an M4 Ultra might lie, we have to do some very rough calculations: assuming the same scaling from M2 Max to M2 Ultra, based on an M3 Max a hypothetical M3 Ultra with 24 P-cores and 8 E-cores would've scored about 3100 pts in Cinebench R24, about the same as a lower end modern 7000 Threadripper and about the same as some of the higher end older models (score is roughly equivalent to a 5975WX). A hypothetical M4 Ultra is unfortunately more difficult to estimate since we don't have the Max configuration or even know if said Ultra will be 2x Maxes. And, more crucially, I don't believe Maxxon actually makes Cinebench for the iPad so we don't have even a score yet for the base M4 either. But assuming the M4 Ultra will be some factor faster than the 3000 above seems reasonable, a 24 P-core, 8-E-core M4 Ultra might be say 15-20% faster than the above M3 Ultra putting it a close to a modern 7970X at least in that workload. Obviously hypotheticals upon hypotheticals here but that's just to give a very rough idea of where an M4 Ultra might lie in CB R24. I'm sure there are other, far better workstation benchmarks out there, but CB R24 is common, decently stresses the cores better than R23 did, and at least scales fairly linearly with core/thread count.
So no, Apple makes excellent desktop CPUs and, an upcoming M4 Ultra promises to be a good light workstation CPU depending on its configuration. Whether Apple chooses to ever make an Extreme remains to be seen.