for an example look at how graceful and fully shown off the Vulcan is.
Probably not the best example, most of the displays of XH558 are decried as 'tame', except for those of one pilot in particular.
He did the Saturday display at RIAT and on the Sunday it was specified on the tannoy that the display that day would not be the same...
I agree that old jets shouldn't be put under much stress but there is very little crowd interest in jets that just fly back and forth. Even the Viggen, for all its brute power, has trouble holding crowd attention with this year's rather flat display routine.