How can I trust caddy complies with standards in other areas if caddy isn’t willing to follow the standard (which really doesn’t take much work) in this area? It’d be different if the de facto and the de jure standard diverged, as e.g., with IRC, but that’s not the case. nginx, Apache, IIS, Google’s GWS, they all follow the standard exactly, it’s just traefik and caddy that don’t.
It’s not an issue of this situation in of itself, it’s an issue of eroding trust. It’s the famous brown m&ms.
P.S.: Your arguments explain why implementing this would be a lot of work (keeping the ticket open as known issue is something I’d be fine with), but they can’t justify ignoring the standard and closing it as wontfix.