Earlier quoted context omitted.
Why does leg length matter? Reclining doesn't impact leg room much since only the upper part of the seat is moving backwards any significant distance, and the space under the seat where my feet go is completely unaffected. Are your legs so long you have to sit with your knees pressed against the back of the seat in front of you or something? If so I suppose that's understandable.
Yes, my knees often/always bump into the seat in front of me, even without it being reclined. If/when it is reclined it means my knees are pressed harder backwards. When I can, I pay for extra leg room or get an aisle seat. My opinion is strongly that seats should not be reclined. It is inconsiderate.
But maybe in the future I'll make a point of checking whether the person behind me is in the 95th percentile of adult male heights before reclining.