That’s such a ridiculous statement.
Yep.
> [learning a language is] only helpful for high professional tasks or close literary study or prestige.
This is a person who doesn't understand actual face-to-face communication, like, at all. Even though translation apps are amazing, in a social interaction, there's no getting over the imposition of the halting, hesitant back-and-forth of device-assisted translation. Sure, you can almost always eventually get your point across, but you're never going to set the other party at ease in the same way as speaking their language yourself.
Sure, but how often does that happen in most people’s lives, especially in the US?
When they’re on vacation? Very few people are going to learn a language that they could use for a week or two in a place where people probably speak English better than whatever language you’re attempting anyways.
Obviously there are exceptions.