I strongly disagree with you there dj, if you have confidence in your postflop game, you're trying to limit your action and outplay your opponents easier, less opponents= easier decisions, remember when open limping you have zero postflop pot control making bluffing
near-impossible, you force yourself into playing multi-way pots and not being able to apply ranges because your opponents are limping behind a very wide range, and you can't win the pot preflop. Open limping should be done in very, very few spots of which you have specific reads in. These days its pretty simple.
2.5x open from MP, get 1-2 callers, cbet whether you hit or not and get your opponents to fold around half the time, sometimes more if you get HU on the flop.
limp from MP, get raised and put in a tougher OOP spot or have 3-4 players limp behind and force yourself to play fit-or-fold and making guesstimates on what types if hands your opponent has. This is just my experience playing $1.10-$11 MTTs
Even if you have a small pair, why give yourself only one way to win the pot and not build a pot for the cases you do flop a set?