Ha ha ... it's really tiny, compared to my other cameras' big ones ...
I agree it is ridiculous if one cares how one looks in the streets. I tried to be hardcore and not go beyond 50mm, but it just doesn't work for me. The 135 (or 90mm) is a tool that I want for certain pictures. This is what is important to me, and it's cheap compared to other Leitz lenses.
And I'm not into Leicas because of their name, or looks, or rangefinder ... it's the superb B&W negatives !
I also think 90mm with the hood is ridiculous to look at on the streets mounted on a small Leica M. It doesn't bother me of course, I couldn't care less, but I'm sure it bothers some who are more worried at how they will look rather than worry about getting pictures.
At any rate, my favorite is 35mm and 50mm, up close and personal, which is what I believe rangefinders are meant for the most. 28mm and below is too intrusive for me, I need to get as close as 1 meter to get a decent sized person in the composition, and they'll hear the shutter click too, and I'm no sprinter 🙂
90mm and 135mm are for special uses, definitely not even ideal for the street shooting focusing methods - infinity, zone, hyperfocal distance ...