It's possible it is just MacOS doesn't have the EID information.
https://apple.stackexchange.com/a/221498 and https://apple.stackexchange.com/a/233854 has how to fix this. It doesn't sound much fun though.
Yeah I read through all those. It’s a work laptop so I’m not comfortable doing things like disabling SIP or mucking around in any system settings. That machine is my livelihood so I don’t mind finding devices that just work.
This limitation is specific to the MacOS drivers. Windows in Bootcamp is able to drive 5120x1440 on these devices.