Regarding the ESL, I guess it depends on where. FWIW I hear[0] that in Czechia there are so many foreigners whose only significant skill relative to locals is that they are native speakers, that the native English on its own is not enough anymore. The language schools now demand (and have for some time) an in-depth grammar knowledge and possibly relevant education as well. I would expect it to be the same in other Central/Western European countries.

[0] An online account of an ESL teacher, confirmed by two others in person.

(EDIT: grammar.)