back in the 80s when Jimmy Saville was on Radio 2 it catered for the people who were middle aged *then* by playing Sounds of the Sixties
as the radio 2 listeners got older they continued to listen to radio 2 and the Sounds of the Sixties.
meanwhile, the people who grew up in the 80s are now middle aged and demand their own radio station. This is 6music
so, in a sense 6music has always been just the same as radio 2, a swamp of nostalgic "in my day" tunes
That chimes with my experience on the occasions I've (inadvertently) heard it. My younger self would be self-mutilating at the idea I would someday be listening to the modern equivalent of Radio2.
As a sometime musician I really don't want to hear stuff I've heard a hundred times before unless it's something I specifically (still) like. The chances of that happening on live radio are extremely remote.
If I need stuff to listen to when training or on long rides I try and source new music, mainly from new artists, and spend a long tome trawling the net to find it (including many unsigned acts). It's not all brilliant but I select the things I find fresh and stimulating. These form monthly playlists, so new sounds on a regular basis.
Nostalgia is reserved for lazy weekend mornings.