I will go the opposite of Lienn and say that I 100% agree. That's what made FFXI missions entertaining and always a challenge. Whats the point of outranking a mission and complete it with hardly a sweat or leeching a group of high rank in your LS.

Level cap is always a good thing. Promotes skills and challenge. If you find level capped missions too hard for you, then go learn to play some more or change your strategy. If a mission was capped at X rank, it means it was balance for X rank and doing it when you are 10-20 ranks above just destroy the purpose of it all.