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Anything outside of port 80/443 will be blocked at some point.

Blocked by who? Are you talking within some specific context, eg. corporate networks? Because HTTP/HTTPS are both TCP based protocols with some very limiting characteristics for many applications.

There are a whole lot of applications out there in widespread use that depend on UDP at the very least, eg. most multiplayer network games, just to use the simplest and most common example I can think of. Not everything can (or should) be stuffed into a HTTP transaction.

Yes, the blocking problem mostly affects corporate networks or shady wlan access points.

Game developers don't really have a problem with using UDP/TCP on random ports.

Sure, but there's a bit of a stretch from there to the parent posters claim "anything outside of port 80/443 will be blocked at some point" as a justification not to develop new, non-HTTP based protocols.

Of course, it's just a sloppy excuse.

Only if nobody uses those ports.

I want as much as possible to break for people who block those ports, and engage in other user-hostile actions.

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