Yes, I know that part-avios for a cash flight isn’t great value but with 250,000 Avios in the bank and a 2-4-1 on the way, I’m really not too fussed (especially as I’m also after the Tier Points to requalify) so it works for me partly for the simplicity.
I’m a big fan of RFS flights, too, so I don’t feel too hard done by(!)