I honestly don't think openings matter as much as other things.
I made the big mistake of focusing on studying the dragon before everything else about 7 years ago when I was in middle school, and I would get decent positions and survive the Yugoslav Attack, but I would lose most games given most of black's wins are in a technical endgame where black has a better pawn structure but down an exchange, and I just didn't have any endgame knowledge, so his rook would always outplay my knight. (I was 1300ish at that time) and I was stuck there for about 3 years until I began studying endgames and my rating skyrocketed to 1800 within a year.
Based on my games vs GMs and IMs, I know that I can hang around an equal position, but they always know when to trade down, and what to trade better than me, which helps them get a winning endgame.
From what my titled friends have told me, opening preparation only starts to matter when you play in tournaments when you know who you are going to play and you have enough time to prepare for said person.
Bottom line, I'd say to disregard the opening until you improve the other areas first...
So all the IMs and GMs out there always harp on openings being the last thing you need in order to improve your chess, but then when asked what it takes to go from expert to master, or what they need to do to get their next norm, they often say:
"improve openings.."
I feel like most chess instructional / advisory content online is aimed at 1200-1800 players, and i agree, at that level openings dont matter as much because no one plays deep theory anyway, and they wont be punished for not keeping up. But when does it start playing a role?
For instance, so far i got by with just 2 obscure unsound side lines against any and all sicillians, but ive played them in multiple tournaments already, and anyone who prepares for me will know how to refute them.
I want to study strategy, endgames and all the "important" stuff, but more and more often i end up spending tons of time in openings that i just dont know well enough.
So id love to hear from some 1800 >= players. Are openings actually important at this (my) level, or am i still just falling for the amateur bias and am nowhere near the stage where openings actually matter?