I think there is massive confusion here and not shockingly the Mom Panel was not really answering the question nor give all info.
Lightning Lane is simply where one returns.
LL is not just ILL. It can be ILL, G+ rides, DAS, Baby Swap, etc. Individual Lightning Lane rides are separate and require a fee of like $10-15 per ride.
We cannot pre-book any ILL for free.
G+ is $15 per day unlimited and those can be stacked in a way DAS cannot. DAS can prebook non-ILL rides or do a return time for ILL rides outside of ones with a VQ. If there is a VQ, then you can use the LL to skip part of the queue. You cannot just try to get a return time for VQ and you are stuck doing the 7 am thing like everyone.
DAS can only be pre-booked for the following:
Help
disneyworld.disney.go.com
None of those rides are ILL rides. We're even prohibited from a couple non-ILL rides at the moment.
I hope this makes it all clear for DAS users. You can purchase ILL rides if you choose like everyone else. You cannot pre-book for free. You cannot stack DAS like G+ you can pre-book two from the list (non-ILL rides) and have one single floating one though. You can also choose not to book any as I have done and just use the one floating. You can book via the app. If you ever run into issues (and that's a warning because we did a few times in June even) Guest experiences can usually help.
I've used the new system on my last 3 trips and know the good and bad of it.