I addressed pdb1 in the first sentence for a variety of reasons. On mobile, you have to do more than login. Also, taking my tablet to work to play a round for my consecutive days xp was far more convenient than taking my desktop. I don't know that taking one shot on mobile gets you the xp bonus. I had to quit a round once because, well, life happens. It didn't reset the consecutive days, but it also didn't give me the xp for that day.
I'm indifferent to whether someone plays on PC or mobile. I kind of wish I had started on PC, because I believe that a person can probably be better on a PC. However, I found the game on mobile and that's what I got used to. When I tried on my desktop, I was more awful than normal. So I've just resigned myself to the fact that I'm probably as good as I'll ever be.