When a backroute should be patched.
1)when the backroute essentially changes the difficulty rating of the level to an easier one. If your level is taxing, and the backroute is easy, it obviously should be patched.
2)when it removes an intended "aha!" moment that's supposed to stump you until you figure it out. This should only apply to techniques that are relatively easy when you know how to do them. Difficult and non obvious techniques shouldn't be used to gatekeep a level solution.
When neither of these two apply, there's little harm in leaving it in.
When the intended solution involved a somewhat obscure, but not difficult mechanic, there should be some sort of clue in the level name, even if players are likely to have worked out the trick before. The classic example of a name with one is "How do I dig up the way?"
1)when the backroute essentially changes the difficulty rating of the level to an easier one. If your level is taxing, and the backroute is easy, it obviously should be patched.
2)when it removes an intended "aha!" moment that's supposed to stump you until you figure it out. This should only apply to techniques that are relatively easy when you know how to do them. Difficult and non obvious techniques shouldn't be used to gatekeep a level solution.
When neither of these two apply, there's little harm in leaving it in.
When the intended solution involved a somewhat obscure, but not difficult mechanic, there should be some sort of clue in the level name, even if players are likely to have worked out the trick before. The classic example of a name with one is "How do I dig up the way?"