I've used several kinds of reeds on several kinds of mouthpieces and the shapes of the tips never seemed to match. That is, they didn't match until I mounted a La Voz tenor on the anonymous white mouthpiece that came with my new 1955 Conn 16M. Their tip shapes are a perfect match.
That got me thinking: how important is it that the shape of the reed tip matches the shape of the mouthpiece tip? I make sure I don't leave a gap when the tips are shaped differently, but assume many of you who work on your reeds also trim the tip to match a mouthpiece. Does it make enough of a difference that even a mediocre player should get in the habit of doing it? I have some dexterity issues and try to avoid attempting fine craftsmanship when possible, but will risk injury to reed and fingers it if it might be worthwhile.