"Don't let the perfect be the enemy of the good" may also be relevant here. By all means, criticize proposals to help weed out those that are truly bad and to refine those with problems into something better, but don't rule them out entirely because they don't check every box.

Obviously every situation is different and cost-to-benefit must always be weighed, but I think it's often better to implement an imperfect solution while waiting on something better.