If I was building a crash cart today (without knowing the environment) I'd have at least VGA, DVI, HDMI, and DisplayPort as options. It wouldn't be too difficult to get a monitor or setup (adapters) to support them all, especially if one just needs to buy a couple for the datacenter or whatever.

Its not like you need 144Hz 4K to troubleshoot a server - its a good enough defacto standard.