I'm still using 27 and 40 meg sets, one is 30 years old, and I love my Fleet set, solid and a joy to use, real metal construction.
I use them because they are and always have been faultless, plus I can sail my models in the radio deadspot our lake has where the 2.4 models can not go.
2.4 sets are fine, but change for it's own sake is pointless. After all, if age ruled something out, most of us would have to give up modeling.
Chas.