Bike manufacturers: "we have changed to a single/twin carb, to assist with starting and improve power delivery" remember the XR series went to dual, back to single - always the above claim.
Most bike journos: "this bike is the greatest MX bike ever. The power delivery and suspension action is supurb..."
Next year: "the Suspension has been redesigned to adress the poor function of last years model and the new cam helps with the weak top end power that plagued last years model.."
MXA is one of the few magazines that will actually criticize a bike. They are still claiming the YZ forks (old school springs) are by far the best of the current MX bikes.
New "air spring" models are easier to market. The current gen think airforks are new
The incremental improvements have resulted in some incredible bikes.
I marvel at my ('08) 250F MX bike every time I ride it.
I ride my aging (relatively - 2006) 450F Enduro bike thinking how amazed I'd have been to hop off my TT600 (first model) and onto the modern 450. It would have impressed the teenage me!
Lightweight, is always good to ride.
("Light, Strong, Cheap - pick the two you want" - old cycling adage)