I think its perfectly acceptable to go on an unplanned trip. I've had friends who go last minute and they have a great time. They have different priorities... One of my co-workers went and her goal was to ride Dumbo like she did when she was a child. She got to do that - she instagrammed it - and she was completely thrilled with her time at WDW.
My concern for the original post - it sounds like this person WANTS to do a lot. By the number of TS reservations she is familiar with - she should be able to do some of those.
Unfortunately because of a bad
travel agent... This is not going to happen.
This is why Tony's Town Square and The Plaza Restaurant in MK can be so mediocre... because that is where these poor folks wind up.
I think it breaks our hearts because we know they are spending a lot of money, and could be having a higher quality and more enjoyable time for those large amounts of cash.