Sure, but how often do you have them on your person in time to take candid photos?
I am in a lot of entomology and myrmecology online groups and people are able to take clear photos of insects that look like professional macro photos using their phones. Before that, only a handful of pro/powerusers were able to share this kind of quality.
When asked what camera he used, one popular youtuber (I cannot remember the exact context) explained that while expensive cameras are better on paper he often relies on his iPhone + a cheap ring light clipped on it. Animals often act in interesting ways when you are not ready for it. The ease of using the device that is in your pocket often outweight the potential increase in quality that would come from setting up a studio level setup. The best picture is the one you are able to take.