And of course there are fewer and fewer "new" aircraft. An RAF flypast would include the F-35 as the most modern type - but that's 18 years old
Even worse with civil types - they all look the same, they're all pretty derivative (the average man in the street can't tell the difference between a 737 and an A 320), and they are really boring to watch
Displays are much more H&S complaint and the aircraft themselves are packed with systems to PREVENT any excitement anyway
You also used to get different designs from different nations - now they all buy the same few types and repaint them.
The only thing left are the display teams...........