True although by that point your probably good enough to get the job without it lol.It is better to learn the patterns of the bosses first and when you get closer and closer to the victory it makes totally sense to use the items to give you the edge in battle.
You can't run back there is a fog gate!
I always hated the pressure of having to get it done with just one or 2 attempts. I am much more relaxed just fighting a boss normally.
For me it just deincentives experimenting with all these cool items resulting in a shallower game . Maybe that's just me.