In the 1970s and 80s, the London was a black defence to white's king's fianchetto openings, considered solid and rather dull but it blunted the fianchettoed bishop. I'm not sure what it was called in Mason's time. I have a first edition of his chess manual somewhere, I think, unless I sold it. If Mason played it, it was probably a "Queen's pawn Game". I was only aware of the name "London" for black's defensive setup. Mason was a decent player and so I doubt he played it "to lose".
Personally, I think that, played by white, the London is a very good transpositional system which is completely solid. Should be impossible to lose with and white can set positional traps for black.
I play the Caro-Kann as a second string to the Sicilian. Or at least, I attempt to play it. I think that black must be willing to castle 0-0-0 in the Caro, making it quite a risky affair, far from the idea of solidity that seems to be portrayed by some. If black isn't willing to 0-0-0, then f2-f4-f5-f6 is thematic and seems to be strong.
there are openings that limit you as a player and openings that dont, and openings that you can learn from more than others.
Let the chess Masters say it with such authority. In any case, they do not agree at all with each other about London System.
This is absolutely personal. What is boring to you may not be boring at all to another, and vice versa. Play the openings you like, and let others play what they like.