The hitbox of weeping vines is too large for its appearance. This leads to many instances where, while climbing a vine, it is very easy to accidentally break the vine (which can lead to death by falling) - when the player actually meant to target a different block. The problem comes from the player not being able to see that they are targeting the vine, because its hitbox encompasses an invisible part of it (which is rather large!). It should not be possible to break a block when you can't even see that you are targeting it, especially if it is one that you are climbing.

Moreover - the risk of falling aside - the sheer size of the hitbox makes it difficult to do any tasks while on the vine, such as placing things on other blocks.