This has always been an issue with Leica even back many, many years ago.
Here's my little story for what it's worth (probably nothing): I shot Leica rangefinders exclusively from about 1997 to 2008. Even in Leica's dark days, circa. 2002-05, I upgraded much of my system to include many new items, including M7, MP, 35mm Summicron ASPH, 50mm Summilux ASPH, 90mm Elmarit. I mention this to show only that I was a real Leica junky.
Well, in circa 2008 I went on a nature trip that required an SLR. I just happened to select the Leicaflex series, and I used these cameras for the next several trips. What I found is that, even though I was using 70's optics, my pictures were so much better, and the picture taking process was so much more fun with the Leicaflex. It took a few years, but I eventually got rid of the rangefinder stuff. Fortunately I was able to pull most of my $$ out of the system. Since then I've tried a lot of different manual and/or mechanical cameras from other makers.
There was a real addictive quality to owning the smashing new Leica stuff, and the 50mm Summilux ASPH was one of the few lenses I ever used that had that 'whow' factor, but I would never, never, never buy new Leica stuff now for a film user. Too many nice alternatives at a fraction of the price.
BTW, today, for my rangefinder fix, I'm using a pair of Kiev rangefinders made in the 1950's. Very impressed, especially given the low, low, low, price.