In fairness it has some of them; just in a package that is profoundly alien to trends in server construction.
The $50k configuration is presumably the one with the Xeon W-3275M. Intel sticker price is $7,453. Apple presumably pays less, and you might too depending on your rep’s buying power with your vendor of choice; but (as sad as it makes the people pining for a decent expandable Mac desktop) that’s pricey workstation gear. For RAM, OWC wants $20k for 12 x 128.0GB PC23400 2933MHz DDR4 LRDIMM; again your buying power may vary but that much load-reduced ECC RAM isn’t cheap.
GPUs are a little trickier because Apple uses a custom variant and I’m not entirely sure what the naming of the closest equivalent standard card is; but $2500+ for a workstation card with 32GB of RAM isn’t unlikely.
If you want what Apple is selling it’s hardly a rip-off for the price, and I strongly suspect that the fit and finish and attention to detail are all gorgeous and such; it’s just that it’s profoundly alien relative to typical server design conventions:
At least the option of PSU redundancy is there on all but trash-tier servers(and a fair few workstations); a BMC(albeit often gallingly licence locked until you stump up just a bit more money; yeah, that’s you HPE, you know what you’ve done) is just expected in servers and common in workstations; and throwing in at least a few accessible and hot-swappable SAS or U.2 NVMe bays is ubiquitous even outside of storage-focused or “generalist/balanced” systems.
Single socket isn’t as crippling as it was, per-socket core counts have increased substantially lately(though Intel currently isn’t the one to stick with if you really want that); but even 1U pizza boxes are at least offered in 2 socket; and if you care about CPU density the quasi-blade “4 node 2U” units seem to be popular these days, which will get you 4x dual socket nodes, sharing PSUs and some support bits and pieces, in a 2U chassis; for 4 sockets/U.
I/O is also very atypical: not too surprisingly this thing has absurd amounts of Thunderbolt; but between the effective nonexistence of switched Thunderbolt and general niche status(outside of laptops and mac-focused accessories) that’s absolutely not what high speed I/O usually looks like. On that score the 2x 10GbE isn’t as stingy as some of the real cheapies(where 2 or 4x 1GbE still rules; but the choice of Aquantia 10GBASE-T copper, while appropriate to a workstation, is a bit out of place in a server situation. 10Gb SFP cages; or a few onboard 1GbE copper ports plus an OCP or proprietary mezzanine for 10/25/40/100Gb options would be more typical.
What I find a trifle interesting, though probably not too surprising given the likely sales volume relative to their other products, is that Apple hasn’t added BMC/LOM functions via the T2 chip. Just slapping an ASpeed 2500 and a realtek management NIC on the board would not be Apple’s style; but my understanding is that the T2 is a pretty substantial chunk of an iDevice SoC embedded in the system and already handling disk controller and encryption functions, boot security stuff; and some other secure enclave bits and pieces. Full independent computer with close connection to host computer and a security focus is kind of a natural place for BMC functions to live(and since they seem to be building the T2 on iDevice tech adding ‘BMC’ is probably closer to firmware update than major hardware revision).
Probably not enough expected sales(especially to outfits that have IT departments that won’t touch it if they can’t script against some reasonably standard IPMI or Redfish interface) for it to matter; but seems like a thing that they could do.
I expect that the rackmount version will be nice if you are using it with a bunch of other rackmount stuff(eg. pro audio gear); the premium for 1st part rack integration isn’t bad compared to what a 3rd party kit that’s slightly more awkward would likely cost; but if you start building compute clusters out of these things that’s a good sign that you are deep in the Apple software ecosystem.