I don't really care about the design aspect of these things all that much, but part of me does wonder what would happen if we flipped this around - if the quest was offered a really good deal on something, but the only reason that deal was being offered at all was because it was assumed we weren't able to fulfill it in a degree that made any difference? I bet that a lot of AP would be spent to ensure that production capacity was boosted to the nines and to ensure that obstacles in the way of supplying that capacity were removed.
I get that more waystones equals more good, but it does seem as though the main arguments for allowing the elves a freer hand are based on the assumption that Tindomiel acting in their own self interest won't have the sort of negative consequences that we can get on top of right now by constraining their hands a bit. I don't think that will seriously affect the outcome at the end of the project. Everyone wants less chaos, so if the project starts seeing results, it will be in everyone's interests to get involved. Tindomiel have given the quest what seems to be a seriously high price to get involved right now, I don't think it's necessary to pay it, and I think there may be a certain amount of overestimation going on of the urgency of doing so. Was there a reason it had to wait this long before they were offered a spot on the team? My impression is they were voted for because there was justification for spending votes on as many extra factions for the start of the waystone project as possible, and their house was next on the list, along with the hedgewise. There will be time to get more traditions involved as the project continues, surely.