[delecti]

Agreed. You eventually need to take some course of action, so if you can't get everyone on exactly the same page, someone won't get their way. Those people can either accept that their approach isn't being taken, and thus work towards the approach which has been decided upon, or refuse to cooperate, hurting the team in the process.

The only real weakness with "disagree and commit" is if you have a deeply unreasonable leader, and then "disagree and commit" is the least of your problems.