Earlier quoted context omitted.
But we're talking about something used to surf the web. An ARM is still powerful enough and will use way less power.
Web browsing is pretty darn good on the iPad and comparable Android tablets, but it's still a far cry from the performance you can get on x86 hardware. Many Surface Pro reviews mention this specifically. Now, there's still obviously value judgement to be made: is the Pixel worth the extra money, extra weight, and worse battery life compared to an Apple or Android tablet?
MacBook Air 13": 50Wh - starts at $1200
Pixel: 59Wh - starts at $1300
MacBook Pro 13": 74Wh - starts at $1500
Basically, the more you pay, the more capabilities and battery life you get. And both Apple and Google seem in line.