I'm in UK, working at a video games studio and while we work 37.5h a week indeed all training is done during work hours, we hire people from junior and bring them up to senior/expert levels, with our average seniority being something stupid like 12 years+(longest one atm is 29 years). And yes, we only have to be in the office 1 day a week, personally I work 4 days from home 1 from the office, but it's up to everyone how they want to do it.

Probably France

that does look like french salary ranges for juniors

I am also interested in the geography here, especially wrt to the currency/units in "35 -> 50 -> +10k"

Are those numbers maybe denominated in Kuwaiti or Bahraini dinars? Or in some country-specific unspoken convenience unit such as tens-of-thousands of Japanese yen, or hundreds of thousands of Vietnamese Dong, or something like that?

I think your reply sort of proves his point, if 38.5 -> 35 hour workweek is enough to move, well, employers are not getting the best deal.