there are some things that are just blatantly wrong with your statements/thoughts.
1) Letter of intent should be only sent when an applicant is 100% sure that he/she knows that he/she will attend the school no matter what. That is the point of intent. If an applicant wants to play the game and see all of the available options, then he/she should utilize letter of INTEREST. There is a clear reason why there are two different types of letters that admissions accept.
2) Yes, maybe an unexpected beautiful and wonderful full ride scholarship rolls in, which can hinder an applicant's decision for another school that she/he sent a LOIntent to. But let's be real, that does not happen a lot. It's a rare event that should not be so common that any applicant can utilize it to justify their "multiple letter of intents"
3) As someone who is only on waitlists without any A, I am worried and a bit scared that there are parents and applicants who think it's ok to manipulate the system for their own benefit. Maybe this is why applicants now have to take Casper with video interview and all other BS..