It shouldn’t really be just millennials who do this, and there’s a simple reason for it. Just about every web developer uses a desktop for development work, so most of their testing is done in a desktop browser. So mobile-only bugs do slip through the cracks more often, I find. imo that is the reason that to this day, a lot of bugs get overlooked on mobile.

I feel like food ordering services are always the worst culprits for some reason. Many times I have tried to order food on my phone only to get stuck in a login loop or some other bug that makes it impossible. Open the same service up on my desktop and it works perfectly first try