Perking high performance planes will not restrict their availability to veteran players. Most already have enough perks to fly any planes they want for a very long time. Perking high performance planes WILL restrict their availability to newer players, who need an advantage to compete.
Perking high performance planes would have more effect if perks were reset at the beginning of each tour to the values of one 262, one B-29, and one Tiger II. The more successful players would still be able to accumulate additional perks to allow them to fly the best planes, but they might want to save those planes for "special" circumstances.