I don't follow: how are they not server grade? How are they crippled Power9s? What x86 server are you comparing them to?
For example, the Talos II system has dual (server) CPU sockets with up to 24 cores/96 threads per processor; 16 ECC memory slots with 2TB capacity; SAS controller; out of band management and service processor (separate serial and ethernet ports for the BMC); a server form factor; better capacitors; no onboard audio and only rudimentary graphics; and a thick/quality PCB. It's also made in America. What else were you looking for?
For example, the Talos II system has dual (server) CPU sockets with up to 24 cores/96 threads per processor; 16 ECC memory slots with 2TB capacity; SAS controller; out of band management and service processor (separate serial and ethernet ports for the BMC); a server form factor; better capacitors; no onboard audio and only rudimentary graphics; and a thick/quality PCB. It's also made in America. What else were you looking for?