It's always fun to see musicians pigeonhole music into different categories as precisely as they can, while the general public blithely ignores them completely, and calls it whatever they feel like... I've definitely heard a few kids refer to the Beatles as 'sort of oldies music'!

'Classic rock' really doesn't encompass the whole 70's thing very well. You wouldn't call Simon and Garfunkel 'classic rock', or Harry Chapin, or Carole King, or MANY 70's acts.

"Oldies' in the formal sense seems to include several fairly different types of music, it's not just doo-wop, but also Doris Day, Frank Sinatra, and many other artists from that couple of decades.

So what are the 70's and 80's going to get called? (Or are the 60's and 70's going to get lumped together instead?)

Sooner or later, I guess the general public (not us musicians!) is going to decide....
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An arranger is just a tool. What matters is what you build with it..!