Turn it around. A lost ball is the result of a bad shot. Why should the rest of the field in an event have to effectively be penalised because someone else hit a bad shot and gets lots of time to find their ball?
If in doubt play a provisional.
atb
Thomas,
Whether or not a provisional was played doesn't change the fact that a player is going to look for the first ball; the difference is two strokes, which is huge in a competition, and that assumes that the provisional is in good shape. And the issue of whether or not the player hit a provisional is a different issue from the issue of whether the search should be 3 minutes or 5 minutes; if the player has to return to the tee, that takes as long as it takes, regardless of how long the search prior to that was. I think we all agree that we SHOULD hit provisionals; the Walk of Shame back to the tee is to be avoided at all costs. But we also all know that there are blind shots, heavy rough, etc. that cause balls to be unexpectedly lost or OB. That's golf.
I've played quite a few tournaments since the rules change, and I have to say that the change from 5 to 3 just hasn't seemed impactful to me, even in competition. In MOST cases, it seems to me that the ball is found within 3 minutes or not at all, and certainly not in a playable condition. I'm sure there have been situations that I'm not recalling where the ball was found in the next two minutes, but that happened when the limit was 5 minutes, too.
I do NOT believe, though, that it is an especially significant way to speed up play, even if followed religiously. Two minutes a couple of times a round just isn't significant. I am, however, a BIG fan of the new rule for casual play of allowing a drop with a two stroke penalty instead of a return to the tee, which can also be adopted as a local rule for competitions; that one really can speed up play, because it is a better option in a lot of cases than even hitting a provisional, much less going back to the tee.