A wide diversity of humans can and have learned to speak the pilot/ATC dialect and cadence; and, English is the generally accepted lingua franca for flight.
I am not sure how class enters the equation, although it seems to me likely that travelers would prefer to hear neither George Plimpton nor an East-End eelmonger over the intercom.
There are probably thousands of people who would be better pilots than the current average, who have no hope of ever qualifying because of either the cost, or the traditional hiring/training patterns of airlines. Maybe that doesn't bother you as a passenger, but it does seem to bother the airlines themselves, who keep introducing programs to address the issue which everyone here clearly knows better than them about.
My point isn’t that planes are racist, as I suspect you know. All I’m saying is the reason most pilots on UK airlines sound the same is because they are the same. Whenever there’s an occupation where we might have a clear cut image of what those people look or sound like (lawyers, doctors, journalists) that’s some small indication that there’s probably a diversity issue at play. You can argue it doesn’t matter, and look, I even said “sub-optimal” up there, I wasn’t trying to call anyone evil. And while race and gender are issues I was also just as much thinking about working class kids’ access to these career paths because of the enormous debts they might have to run up. I share this viewpoint with such radical leftist organisations as the British Airline Pilots’ Association.
I don't know about the UK, but in the USA, many pilots come from the military.
In the USA, if you want to learn to fly for free, rather than with "enormous debts", it's simple.
All you do is go thru the US Air Force Academy. They take black, white, male, female. They will train you for "free". Yes it requires a service commitment but it's by-and-large a meritocracy.
In the USA you're not entitled to pilot training merely for the sake of "diversity". Pay your dues, earn your way.
I had a cousin who did it. He flew jets for the US Air Force for years. He then became a commercial pilot.
I am not sure how class enters the equation, although it seems to me likely that travelers would prefer to hear neither George Plimpton nor an East-End eelmonger over the intercom.