[Proofrock]

Since it's a 5-way pot I'm less inclined to wait to the turn because your hand is especially vulnerable here. Any 4,5,6,8,T, or J can complete a straight. Any 9 or 7 can easily make somebody trips, and any ace obviously hurts. Furthermore, since the flop is rainbow roughly 3/4 of the time you'll put 2 to a flush up on the turn (i.e., adds flush draws you won't be able to over-charge on the turn). Also, any pocket pair is getting odds to call to hit a set. That leaves very few turn cards you can safely raise and expect it be correct (in a FTOP kind of way).

Raising the flop at least charges backdoor draws and pocket pairs too much to draw.

I think I would like a delayed raise better on a board with a slightly different texture or in a large but not huge pot like this that is both (1) multiway and (2) large enough to give extreme longshot draws odds to hit with no flop raise.