Remember all those feature phones with a plethora of custom operating systems? Almost none of the users cared (or knew) what the OS was. This is an OS for that kind of device. Nokia is shipping it right now.
I'm just saying that whatever OS will be useless to a lot of people if it doesn't run what they want it to. One way to do that is to make it compatible with Android apps, which have already a version of virtually every major app.
Also, in my original comment I was speaking more in general rather than about KaiOS alone.