What is important in poker is to put everything in perspective of advantages. There are 3 advantages in tournament poker: 1) Card advantage (or potential advantage); 2) Position; and 3) Initiative.
I teach my students to think about advantages and not the cards themselves. With suited connectors this is how you should think about the hand. Is my stack deep enough to pay off to a potential card advantage? ie If I raise, is my stack deep enough to get a big payoff if I hit a big hand? Do I have position? Will my raise obtain position? Can I make the players left to act who have position on me fold with a raise? Can I win this pot with initiative? that means, if you raise preflop, can you win the pot post flop without hitting your hand?
If these questions obtain yes answers, you should tend to raise with your suited connectors. Remember poker isn't always about having the best hand. You only need the best hand if your opponents make it to showdown.
Too many poker books
teach an old stale system of thinking of only thinking of card strength in absolutes and forgetting potential strength and initiative as valuable advantages.