I cannot speak for Valley customs. But all of the (non-Valley) companies I'm familiar with extend business class to employees for international travel as a matter of policy.
I must work at the wrong places (non-Valley). Maybe that used to be common, but in recent years I don't see that for regular employees at all. Maybe for some layers of management.
I worked at 1 company that did business class IF your flight was over 10h or something, but in 2008 that got revoked. Since then not seen any business class for mere devs.
fwiw I've done a fair bit of international flying as an engineering guy over the decades and the only time I flew biz class was when going to an interview at Microsoft 20 years ago. Good times...