Because there are quite the number of countries that run massive nation-scale censorship and surveillance campaigns. Google going all-in on encryption of everything, LetsEncrypt being founded - all of that is a direct response to the actions of the US government wiretapping everything including Google's internal datacenter communications and countries like China, Russia and Iran running massive disruption campaigns.
And that doesn't even touch private entities messing with the Internet traffic of their customers - most notably ISPs not just delivering wrong answers on non-existent domains on their own DNS servers to serve ads instead of NXDOMAINs, but going as far as to hijack and rewrite all DNS traffic for that purpose. Or that sniff on DNS requests to sell that data to advertisers (or to the NSA).
And to make it worse, the various "middleboxes" along the Internet placed there by employers forced to comply with dumbass laws, by ISPs doing above-mentioned DPI and manipulation, or by governments of all kind have led to an ossification of Internet protocols because even trivial stuff could lead to issues (remember DCC SEND STARTKEYLOGGER 0 0 0?).
Yes, it is a good thing that Google leads the way in making encryption ubiquitous. Fuck governments, fuck ISPs, fuck everyone who thinks they have a right to intercept, snoop on, track or analyze my communication.
PS: If an employer (or you) wish to inspect traffic, there are many solutions - the most obvious being a private CA root cert to be installed on the client.