Yea, it used to be generally true that "if you can connect them with a cable, they will be compatible." Ports were single-use, and if two ports weren't compatible, then they would be physically incompatible. If you could get a cable to connect two different ports, they would probably be compatible because who would make the cable otherwise, right?

Now we have something like your "omnibus" port in USB-C, so you have potential incompatibility at the port level and at the cable level, and no good way to tell what will work and what won't. The good news is you only have one port, but the bad news is you don't really only have one port.