Unless it's a server motherboard, it most likely supports DisplayPort or HDMI, possibly even over Thunderbolt/USB-C?
Legacy compatibility is not an issue (unless it makes things complicated, unreliable or limited in the name of backward compatibility). Lack of modern functionality is.
Similarly, presence IPv4 support in devices is not a problem - lack of IPv6 support is. The comparable issue would be if you have bought a new motherboard but all it supports is VGA - now, that'd be quite inconvenient (even if it's a server board that runs headless 99.99% of the time).