I still have to shake my head when I hear that openings don't matter much and that endings are the most important.
You see, I started playing chess in the 1950ies. At that time, openings were emphasized again and again and again in most chess books. Reason: if you screw up the opening, you'll be screwed by the mid game and may never get to an end game.
Don't get me wrong. There are three parts to a game: opening, mid game and end game. They are all important It is best to be proficient in all three.
To shrug off the opening as "not important" boggles my mind.
At my rating you see all kinds of crap. The patzers who want quick checkmate in the opening, tempo wasting moves
They were taught to play that way by park tacticians and were influenced by blitz players purse snatchers muggers they smash their opponents and run away no finesse or quality to their play.