I do not have windows phone, but I suspect that with bigger market share (than Jolla), more device manufacturers and more marketing money, you also get more 3rd party developers to provide applications for yopur platform. So no doubt windows phone has more of the "essential" applications supported (facebook, whatsup, skype, ..) than Sailfish.

If Jolla phone would have had 2% market share, I believe Jolla would not have had the latest financial crises and Sailfish might also have more native 3rd party applications, especially from the "big names" like Facebook.

If the Intex phone comes out and succeeds to sel enough so that Intex keeps cranking up more Sailfish OS phones, the situation might get better. Especially if more manufacturers come up with Sailfish phones.