[alexanderscott]

didn’t say need to be “fluent”, said need “working understanding” in today’s environment. countering that idea is futile.

working on an open source JS framework is great and all, but doesn’t make you a seasoned engineer IMO.

TlDR: take this list and dedicate time in 2021 to learning so you can be productive in real world business engineering teams

[yladiz]

Obviously the author is productive on a "real world business engineering team" considering they work for Facebook. Since you seem to have a lot to critique about the post and the author, maybe it's worth putting in that effort into reflection and self-criticality as well.