In my opinion openings are beneficial to learn at any level. The sticking point is how much you should focus on them and how you should approach it. Most instructors say don't worry about openings because students have a habit of overly focusing on opening moves and memorizing things that wont help them stop blundering a queen every move.
So the correct way to go about studying openings at your level is to not memorize actual moves but rather ideas. Studying openings is crucial for you to be able to know how to play the rest of the game, for example: where to direct your pieces, where to place your pawns, do you want the center open or closed, am I going kingside or queenside etc. If you don't study openings, you're missing out on this. The sooner you start to build the foundation of what you're looking for in an openings, the less of a chance you have build bad habits and guess your game plan. This also helps you stop making unnecessary blunders because you'll be putting your pieces on squares they should be. The opening is the only part of chess that's guaranteed. There's no reason to not have the fundamentals down pat.
Currently, I'm about 1570 in rapid. I've seen games on youtube from 1800ish rated players that know the openings they play, so I was wondering when do openings really become useful. I've heard people say that 1400 up you should learn. I've also heard until I get 2000. I honestly just want to hear about your own experience.