here are some of the major issues I see and experienced first hand
1. Not able to pre-plan your park day (where to begin/rope drop, know what you will get to do and when)
2. 7am mad dash the day of is bad, and even more so if you are trying to book a LL and ILL or virtual queue at the same time
3. Not able to select times you want
4. Not able to modify a LL
5. Zig zagging all across the park because you have to get whatever open time it gives next which could even be overtop of a dining reservation
6.and it’s just too confusing to most, I’m a tech guy so I knew how to use it and get the most I could out of it, but in return it became my most stressful and frustrating Disney trip ever also being able to take less in from the parks, being on my phone more than I would have liked, and not doing to normal routines likes previous trips (breakfast each morning at the resort, less shopping time, unable to preplan park navigation for the day, etc)
There is just so much bad with it, not just the availability and lines because of it