Google told their account reps that interface with agencies to split campaigns into mobile-only campaigns as a 'best-practice'. Everyone that listened to them now has to make a decision on how to restructure their account. Google is assuming Tablet, desktop and laptop devices are essentially the same behavior. Therefore, there won't be any way to bid specifically on tablets - they will have a CPC of desktop devices. That's a very dumb assumption on Google's part and they know it. They should allow advertisers to have a % bid increase/decrease on tablets as well within one campaign like they do on enhanced campaigns for mobile devices.
Everybody knows that Google failed to get advertisers to partake in mobile advertising. They spent a lot of money and put a lot of resources behind convincing agencies and individuals. They failed. So they change the rules and just force everyone. Google IS evil no matter what anyone says. Plus, people often give Google too much credit for being advanced. If you look at how their algorithm matches keywords to ads... it's so simple-stupidly pathetic. It ends up costing advertisers much more simply because their ad-serving technology is a piece of crap.