Surely VGA is simpler to implement than VGA and doesn't carry the burden of HDMI licensing requirements. It's common to see VGA and PS/2 connectors on server boards. A little bit fuzziness on the console output isn't going to stop a sysadmin from getting work done. :)
It's just that displays have been omitting vga inputs for a while now.
At least on the crash carts I've used, the displays were always VGA. Not sure if that's still the case. I'm not sure why.
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.
For a crash cart, you can pick up a vga capable display at your local thrift store for $20. The specs barely matter, it just needs to work enough to get the network management back online.
I've yet to see servers with anything other than VGA. PS/2 keyboard connectors are going away (this one doesn't have one), but there'e too many crash carts built around vga to change for the moment.
That's absolutely normal for something meant to be in a rackmount server. This is not a desktop workstation board.