Not missing the point at all ...
Indeed you are...
...some of the best wedding photographers in the UK use canon speedlights and have done for years... I have the canon system and love it so it gets my 2p worth
Of course they do, no one says you can’t make great pictures with the Canon RT system, that’d be dumb.
But some people use an actual complete system of lights, and if what you need is a complete system, Canon can’t provide it. No one says it’s for everyone, but it’s stupid to suggest that Canon does fine if someone needs other features.
Some people want 2nd curtain sync off camera (Canon don’t provide the option)
More power than a GN of 60 in a portable package (Canon don’t provide the option)
Speedlights that move us away from AA batteries (Canon don’t provide the option)
A simple bracket to fit decent modifiers to your lights (Canon don’t provide the option)
Portable and powerful TTL and HSS lights (Canon don’t provide the option)
Mains powered studio flash including high speed flash that’ll freeze motion (Canon don’t provide the option)
And all of the above controlled by a single protocol, from an on camera transmitter or cheap flashgun.
Again, nowt wrong with a Canon 600 ex rt and controller, but for similar money I can buy a speedlight and a 200Ws barebulb flash (that’s not much bigger than a speedlight) and a controller