Or, create apps for the platform used by 7x as many people before bothering creating them for the worst of them all.

Having developed for all major three mobile platforms, I would order them as Windows Phone, iOS, Android in what concerns developer tooling, with Windows Phone having the best experience.

Sadly Microsoft management has shot themselves on both foots multiple times.

For development, perhaps. I am speaking about actual usage.

I wouldn't say Windows Phone is the worst. It performs well on low spec hardware, it gets updates, and the Nokia lineup provides better value than equivalently priced Android phones.

Disclaimer: Posting from my Lumia 640