I gave it (and e4) up because I wasn't ever going to reach the levels where positional play matters all that deeply. (Which it just doesn't below GM.) I got...and get...far better results playing openings I know backwards and forwards. And that creates far more tactical opportunities than any other plan I've encountered.
People who want to believe that chess is all about pushing the boundaries of opening theory...or some relentless pursuit for a kind of perfection that nobody short of Kasparov and his ilk are ever going to approach...or getting to play your favorite lines that you've got all the books about...
These are the people who call the London "The Boring Opening." Of course it's boring if you want to play a Leningrad Dutch or a Noteboom. But as white, is it your job to entertain the other player, or to give yourself the best chance to win? Chess is rarely ever boring when you're in the driver's seat.
In this sense, for almost every chess player alive, the London is objectively a stronger opening than the QG, the Ruy, the Open Sicilian, or any other sharp and difficult opening you'll ever see a GM offer up.
Anyone telling you to focus on 1.e4 until you're a certain strength is hurting your game, and slowing down greatly the amount of time it'll take you to achieve that strength. It's an inferior opening for ameteurs. It just is. Playing e4 will slow your progress. Playing a system will make 99% of chess players the best they can ever be, and will do it a lot faster.
I have to disagree with the above for improvement (if you are playing for fun then ok then what I say doesn't apply that much). You said playing a system gets you similar positions. Ok, and in fact that is what 'hurts' your chess if you are trying to improve, when you need to be used to different positions/tactics/etc....
By the way, positional play does matter imo below GM lvl, just not as much of course (and for a beginner it won't matter at all).
And the London is also unambitious and gives Black an easy path to equality compared to the QG. So how is it increasing your chances to win? Ok, you may know the positions better than your opponent but this doesn't really matter in such an opening. It would matter in something sharp like the Open Sicilian but for the London, the amount it would matter doesn't seem like much.
1.e4 will not slow down your progress. It is the most recommended move for beginners and it is the best for long term improvement...
Explain how 1.e4 will slow your progress. It has a lot of theory but the beginner doesn't need to know this theory at their lvl. A often cited reason to play the London is to minimize opening theory, but it doesn't even matter at the beginner lvl so why not play 1.e4, get a a feel for more positions/tactics, and improve.
FrugalLiving: I would have to debate that. The vast majority of the most experienced chess players and teachers recommend 1. e4 as a "starter" opening because the ideas tend to be easier to grasp, and the principles learned tend to be the most important ones for beginners to learn. And they know a whole lot more about chess then any of us.