Yes, there are so many unknowns. My youngest hasn't napped in a year. But of course, Disney will be exhausting. However, with two siblings, I'm not sure how much he'll nap in the room, and he'll revolt if the older kids go out with one parent and one of us stays with him

He may or may not nap in a stroller. It may take forever to get back to POR to rest and then back to the parks. I still have a poor understanding of how long it takes to get from point A to point B. I know the buses can be slow or a challenge at times especially from POR, so I think we're renting a car. But I still don't even know how long to leave to get from one place to the next, LOL. Very confusing for a newbie

I'm already trying to figure out things like if we drive, how much time do we need to get to Crystal Palace for an earlier breakfast? A full hour? More? I have no idea what it is like to drive from park to park. My last WDW vacation was when I was 4 or 5, and I have a few memories, but no concept of the distance between parks and so forth.
I would rather have the ADRs for now and then deal with cancelling them later. AT least, that's my theory at the moment! Dh and I (and the kids, really) are kind of foodies, but I am not sure if we'll find TS too time consuming overall.
I am fine with adjusting as needed and giving ourselves more downtime. It certainly is hard to predict what our "style" will be at Disney. Worn out is not a good touring style, however!