Quoting the "mean old man", I don't think it's a dilemma (a problem offering at least two solutions or possibilities, of which none are practically acceptable), but a conundrum (a problem having only a conjectural answer). 🙂
I think it's wrong to look at the Leica/CV/Zeiss/... offerings as competitive, because most of us (a) buy used Leica lenses, (b) mix lenses, and (c) the offerings largely complement each other. I consider myself lucky that we have the choice. The LTM/M mount is the only mount next to M42 that offers that variety. As consumers, encouraging that variety should be our common goal, not reducing it by promoting a brand religiously. For example, it can be argued that the CV camera and lens offering has significantly added to Leicas business in the last few years, not the other way around. There are more RF users than there used to be.
As example for (c), Leica does not offer very wide, or slow-but-compact wide angles. On the other hand, there is no real competitor to some Leica lenses, like 75/2 and longer/faster. Only Zeiss offers modern Sonnars, and highest resolution wide angles. Etc.
Reg. build quality (1) no modern lenses are as good as Canon/Leica/Nikkor lenses of the 60s or earlier, (2) any modern lens can have a problem, as the numerous reports on all three brands CV, Zeiss and Leica show. You get a good one you are lucky. Keep it. You get a bad one, send it back or have it serviced. You might consider buying two and pick the better one. That's just an artifact of modern manufacturing (I am guessing the QA processes across the different providers are similar), shorter time to market, less manual testing, etc.
Regarding CV lenses, there are some that show build problems easier than others. The 50 Nokton and the LTM Ultrons are notorious for wobble issues; however, they are probably the most popular CV lenses. Note that ZM 35 Biogon and Planar also sometimes suffer from the wobble problem. I generally find the newer CV M mount lenses (35/2.5 PII, 21/4 P, 35/1.4) very well built, similar to my Summicrons of the 70s (I'm a Mandler fan; I find the lens signatures unique, and used lenses affordable). The 28/3.5 is another CV lens built with very high quality.
Cheers,
Roland.