I guess I can bolster this with the usage scenarios that are probably happening:
People get their phone and try to use the mobile browser, but the experience sucks so they give up (or only use it whne they really need to get some info from the web).
Developers look at the usage statistics, see that no one is using the other browsers and proudly declare that the people whole own phones with those other browsers don't want to access the information that they are presenting to the world, so therefore there is no point in targeting them as an audience.
The problem is that this is the wrong conclusion to make. Just because people aren't accessing your content in a certain way does not mean that they don't want to.
People get their phone and try to use the mobile browser, but the experience sucks so they give up (or only use it whne they really need to get some info from the web).
Developers look at the usage statistics, see that no one is using the other browsers and proudly declare that the people whole own phones with those other browsers don't want to access the information that they are presenting to the world, so therefore there is no point in targeting them as an audience.
The problem is that this is the wrong conclusion to make. Just because people aren't accessing your content in a certain way does not mean that they don't want to.