I’m not sure where this is going other than arguing for fun, but isn’t the best camera the one you like using?
I think anyone interested in photography needs to at least try a DSLR (or similar mirrorless), because for me it made all the difference. Having a physical object to interact with, all the controls at my fingertips and a choice of lenses means I enjoy the process of taking photos much more, which means I’m more likely to learn and experiment and be creative with it.
If you’re not that interested or if you’ve tried it and find carrying the camera around to be a chore, then by all means stick with your phone. It’s great that I can have a very capable camera in my pocket and I get a lot of use out of that too.