Let me try to explain.
When WDW first opened the gate price was very low but there was ticket books for attractions. It was tolerated because the park was new and the gate prices were low.
Then WDW dropped the ticket books and raised the gate price, but the attractions were free so that was tolerated.
Then WDW went to paper Fastpasses. Attractions still FREE. This was my favorite. Only the most popular attractions had paper fastpasses, and the rest were standby. I felt there was a good mix and my favorite part was to go to the end of a the standby queue of a fastpass line and make magic for a total stranger and give them your paper fastpass, you could create some magic for free.
Then WDW want to Fastpass+ This was paperless. Attractions still free, you could even schedule your fastpass 60 days in advance, many folks loved and mastered this system and if done right, you could eliminate the "zig zag" through the parks. Even if you couldn't do the zig zag and you were going to miss your Fastpass time, NO PROBLEM, IT WAS FREE, NO LOSS. I did miss handing my paper Fast pass to someone to make magic, but thats OK it was FREE.
That brings us to the present. Genie+ and ILL, NOT FREE. For all these years we had a FREE fastpass systems and folks LOVED it. Now that valuable service that was FREE, now cost you big time. Not only something that folks liked that was FREE was TAKEN AWAY, but NOW you must pay for a system that does not work as well. There is also the feeling that YOU MUST use the system since you paid for it and there is a loss of freedom there in my opinion. With the old free systems if the day did not work out, you didn't get on attractions you wanted to etc., it was OK there was no cost. Now you must invest money, and if things don't work out, you paid money AND you didn't get to do what you wanted to do, its really a let down and you feel you were taken. There is also the idea that you are a slave to Genie+ and ILL since you paid and, "lets just wait around till our time comes up" I paid for these LLs so I want to use them, then the ride breaks down. Remember all the while, the gate price just keeps going up.
I hope this helps you understand.