I like studying openings. It's like visiting foreign countries. Every opening has its own customs and patterns.
The French doesn't play like the Sicilian. The Queen's Gambit Declined doesn't play like the Scotch. The King's Gambit is what they play int the alternate universe where Spock has a beard.
Yet it's all chess and what you learn in the Nimzo might apply to the French or even the middlegame or endgame.
I believe what you study passionately sticks with you. if studying openings gets you engaged with chess, do it.
If not, play the Colle or the KIA or a QB fianchetto against everything. At the class level or even beyond, you probably can reach the promised land of the "playable middlegame" that way.
To have a good positional instict, you definitely don't need memorizing ANY moves, and that is that. -- pfren
And that's why mere masters have memorized 100,000 opening moves and GM's probably a million. They are just stupid.
And that's why pfren never became a truly strong player. He spent too much reading ECO and the like.
Oh, custard.
How many IMs have you played OTB ? My guess is none given this comment .