Is it flawed if it works exactly as designed? I don't think so.
Just because something works exactly as it was designed, does it mean that it is a good design. They are two different things.
For example, the original seal on the MP eyepiece was a design flaw, as it was designed to keep dust out of the finder and failed.
That is an actual design flaw. As the seal was designed, it failed to serve it's purpose.
The M7 AE lock was designed to lock exposure values and it does so perfectly, and most users never complain about the location of the locking mechanism. How is it then a design flaw?
The AE system only works half the time.
If you are taking a single shot it works perfectly. Meter, recompose for subject (optional), take shot, done.
If you want to quickly take a series of shots with the same reading it reveals its design flaw, because the meter reading is not stored and you need to take another reading after each shot. If you do not the M7 will expose for whatever it is pointing at on the next shot.
As it currently is:
Meter 18% area, recompose for subject, take shot, recompose to 18% area to retake metering, recompose for subject, take shot, repeat.
What it should be:
Meter 18% area and lock reading, reframe for subject, take sequence of shots with stored meter reading, move on.
So, Leica designed a perfect one shot metering system, that fails completely when you attempt to shoot a sequence of images.
Is the M3 flawed because it doesn't have 35mm frame lines?
Is the M2 flawed because it doesn't have 28mm frame lines?
Is my V35 enlarger flawed because it can't enlarge 35mm negatives? I don't think so.
No, those are feature choices on the part of the designer, not design flaws.
If you shoot 28/35 and buy an M3 then that is a poor purchasing decision on the part of the consumer.
The v35 was never intended to support medium format. It's a 135 format enlarger. It would only be a design flaw if they had poorly implemented MF support.
All of these things work as designed.
Just because something works exactly as it was designed, does it mean that it is a good design. They are two different things.