To use, probably inadvisedly, the fall back car analogy.
If you want a car you can buy a Toyota or an Alfa Romeo, the Toyota will always get you there, always, it will get your kids there when you give it to them too, it will never set you on fire but it will never let you down. Or you can buy an Alfa Romeo, you will love it like you never did the Toyota. You can enjoy driving it like you never could the Toyota but you will never be able to rely on it, it will let you down, more than once!
People have different reasons for getting what they do, I'd never critisize anybody for getting an Alfa Romeo, indeed I'd smile at the sound as they pulled away at the lights. But I, personally and in a professional environment, value reliability as a must have feature, I often travel with one body and Canon have never let me down. For me that is more valuable than a hint more dr, or any other specific IQ related feature.
All that doesn't mean I wouldn't like the driving experience that Alfa Romeo would give me, and if a company that made that as well as the proven dependability made a model combining both I'd take a serious look at it, but they don't, yet. Pointing that out about
Canon products is not being defensive or delusional, it just means people have different priorities. As for Canon's sales success, it seems to me that is mainly down to extremely rigid cost controls and value for money in the lower order models. At this point mirrorless can't compete cost wise, so it doesn't.