OpenVPN looks like a regular tls stream - difficult to distinguish between that and a HTTPS connection. WireGuard looks like WireGuard. But you can wrap WireGuard in whatever headers you might want to obfuscate it and the perf will still be better.

It is not a design flaw, but a design choice.

>OpenVPN does not store any of your private data, including IP addresses, on VPN servers, which is ideal.

https://www.pcmag.com/comparisons/openvpn-vs-wireguard-which...