Things are just insanely complicated now but I don't blame the connector. I had the un-fun experience of trying to get 4k 60hz working on my Mac recently. Turns out I had to toggle a setting on my monitor to reserve more bandwidth for display resolution instead of for USB devices. This supposedly isn't a problem if the Mac supported display stream compression, and it's supposed to, but apparently that broke as part of some Big Sur update.

USB has always had software bugs but the explosion of optional features and unexpected hardware combinations has made it feel like Bluetooth; connecting is the easy part, but have fun negotiating all the different profiles and making sure both ends of the connection support the same things.