I'm not saying that the BBC is particularly following or changing the ethos of the Proms but here is a bit from Wikipedia
The Proms " ... inaugurated on 10 August 1895 in the Queen's Hall in Langham Place by the impresario Robert Newman, who was fully experienced in running similar concerts at His Majesty's Theatre.
 Newman wished to generate a wider audience for concert hall music by offering low ticket prices and an informal atmosphere, where eating, drinking and smoking were permitted to the promenaders.

He stated his aim to Henry Wood in 1894 as follows:
I am going to run nightly concerts and train the public by easy stages. Popular at first, gradually raising the standard until I have created a public for classical and modern music."
https://en.m.wikipedia.org/wiki/The_Proms#Origins_and_Sir_Henry_Wood


You could say they dumb down any form of music they promote or you could say they make it more accessible to a new audience.

It's about what I expected.
I've only played about half of it so far but it's clearly not aimed at hardened folkies.
And this is the Concert orchestra. Very "radio2" rather than "radio3" if you know what I mean.

I hope the audience enjoyed it and are inspired to try some more "folk".

I was talking to a non-folky* friend today who had seen bits of it while doing bits around the house ... "There was a singer towards the end[Julie Fowlis] with an amazing voice. I wouldn't mind paying to hear her sing sometime" they said.
So that's an extra twenty quid in someones cash box.
;)* non-folky = (previous conversation) "The trouble with folk is [long pause] everyone is so scruffy. Sorry."