I'd look for a job and tell him I'm leaving only once I've found new position

Pardon me if I'm sounding ignorant but when I think about front-end that complex that it needs architecture I'm starting to become horrified thinking about the amount of javasrcipt transferred over the wire. Let alone the cases when some language like typescript or fable is compiled into js and introduces it's own additional code.

2. These languages are quite fine Regarding 1. I'm sure there may be some bias depending on where are you located but I believe you'll be able to overcome it! Good luck with that!