I agree with nige1 that there are clear benefits to bid 1S or to make a GF raise and that I am also slightly more inclined to to make the 4 card GF raise for a few reasons. It notifies partner that we have 4 card support whilst creating a forcing pass auction. Not only does this benefit against a preemption from 4th seat (as it happened) but they could just as easily bid 2x/3x with their partner preempting further to create more problems. Even a simple 2D overcall could make our auction weird if (and assuming) partner makes a support X and we want to be able to set hearts without pushing the auction too high (say we cuebid 3D partner bids 3NT). Another (slight) downside is that if we have a constructive auction to ourselves, partner may bid 2D or 2H and it could be very hard to catch up and it seems like I might struggle into telling partner about my fourth heart. I may not be able to find that magical grand, but I can still probably try after a GF raise with partner showing extras/shortage and after keycarding I might be able to ask for 3rd round spade control etc. Basically after a constructive auction, starting off with 2NT good things can still happen but after a competitive auction it seems like I'm more well placed.