I dont do much overlimping, and when I do, its mostly small to medium pairs in order to try and flop a set. In theory though equities tend to run closer in multiway spots, and the value of making nutted hands go up. So with many limpers the value of for instance suited aces go up, because they can make the nut flush and also trips with top kicker, if for instance you have A7s, and flop comes 77J.
Suited connectors tend to have reasonable equity multiway, but as you already mentioned, they rarely makes the nuts, and this can be a bit of an issue, when you finally hit the board hard, but then someone else hit it even harder. If for instance you flop two pair with a suited connector, then per definition there is a straightdraw on board, and there are many ways for you to be beat by the river. Or going back to the 77J flop, you dont want to be the player with 87s or 76s and end up losing an enormous pot to the guy with A7s.
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