Mobile devices are more vulnerable to attacks, so it is certainly that wallets for mobile devices (whatever OS) are not mandatory and first priority of projects' developers. Crypto projects only need to have mobile wallets when they have been widely accepted with real useful usecases, and people have enough big demands on coin usages with their mobile devices.
I think you are wrong ,the most hacked attack that happened to me is from using wallets on PC ,since I've been using mobile wallets I have not get hacked for once and its been years already