This is similar to the difference why Fedora is free, but RHEL costs over $300 a year for basically the same software just with added support. Professional/enterprise services are very different from what consumers need.
The new Canon RF lenses are pretty amazing (albeit expensive) though, and the new Canon mirrorless bodies such as the R5 are shaping up to be highly competitive products.
Sony's ecosystem also has many amazing third-party lenses. A personal favourite of mine is the Voigtlander Apo Lanthar 65mm f/2.
[1] https://www.lensrentals.com/blog/2019/03/sony-fe-135mm-f1-8-... [2] https://www.lensrentals.com/blog/2019/08/some-new-wide-angle...
Tell that to Ken Rockwell!
for pros, the ruggedness, battery life, support, autofocus of dslrs are still important.
Especially for Cameras and Lenses that's solely on user's mind.
Your photos speak for themselves. You absolutely don't need Canon or L glass.
BTW, maybe you are not up to date with the current developments, but Canon gets a lot of hate and is looked down because of their mirrorless systems.
The new king is Sony