I'm disagreeing with the premise that you have to develop for their platforms and distribute for it. That's not a fact. That's an opinion. While there may be some apps that _couldnt_ operate on the web, 99% of apps don't fall into this.
Facebook. Instagram. WhatsApp. Gmail. Google maps. Pinterest. These can all be done in a mobile friendly way in browser. They're intentionally not done because of "performance" and the fact that apps want deeper access to the device.
I don't want any or those apps getting access to my GPS. Or my files. Or my contacts. Id rather take additional steps to upload a picture, or type in my "from" address rather than auto-GPS.