> In the era when everyone has a computer already in their pocket? In the era when a Windows 10 laptop can be bought at Wal-Mart for $200 or sometimes less?

Yes. The form factor of a mobile phone is not at all conducive to productivity. You wouldn't buy $200 walmart Win 10 laptop for every guest that would like to work/create a word|excel|powerpoint doc/play games on your computer either.