if Lacuna existed would you do it?

Initially, yes, but I think that, as the film shows, the experiences we have and emotions we feel, the connections we make with people... they have to be taken with the good and the bad. They cannot exist without each other. And we BENEFIT from these experiences, whether they caused our tears or joy.

This is a beautiful film.

Yes, but not for anything consequential. More like a utility room.

A double-edged sword: on one hand, some memories can be too painful to bear. On the other hand, without them, you may be doomed to repeat the same mistakes. I would only recommend forgetting in extreme cases—situations where there is no lesson to be learned that could help you avoid future pitfalls or improve your quality of life.