In 2012 sure, but with so much professional work being done asynchronously and mobile phones/browsers being so capable now mobile availability is table stakes.

A few features may be disabled, but if I log in and see a messed up layout or a "please log in from your desktop" screen it's a big red flag for quality/execution shortcomings that will bite me on desktop soon enough.

There's an entire class of professionals out there these days who don't use laptops. It's possible to run quite a sophisticated business entirely from a phone these days, and a lot of people who are doing exactly that.

Sure, there are professions for which this doesn't work - but even as a software engineer I find myself increasingly frustrated when I can't do things like review a simple pull request on my phone if I'm away from my desk rather than pulling out my laptop.