Why would that put your dates at risk if you already have a planned schedule and max spend? You just responded as if it's crazy they don't have a schedule and budget. Ok.. so which is it? Disney doesn't give out blank checks, so they would have already planned a worst case and max spend, and if things take less... excellent great news everyone.. subs are opening early!
The reason they didn't share a date isn't because they don't know a date... it's they don't want to tell us. That's fair in its own sense because customers get too attached to planned dates - but I don't buy for a second its because they have to wait to drain the lagoon to figure out when they can be done.
Disney knows when they must be done.. because they will use the pocketbook to force it to be done.
Or there is the conspiracy theory they don't share a date because they want to keep their options open.
What will be telling is when we see actual refurb work happening in the lagoon or not.. after it's drained.