There sure isn't any conspiracy theory to 'confuse' buyers. Utter nonsense.
Or maybe there is something to it. Was the M film body naming convention all that consistent and easy to understand either?
First M: M3. Named for three frame lines, 50-90-135.
Next: M2. Does this mean second M body, if so why was the first one named M3 and not M1? Does M2 mean only two frame lines? No.
Next: MP, released concurrently with the M2. Why a letter now after the 'M' and not a number? What does 'P' represent?
Next: M1. Why 1? In this case, no rangefinder. Why not call it an M0?
Next: MD. Back to letters; what does the 'D' represent? Apparently, no rangefinder, no viewfinder.
Next: MD-a. Why a small letter 'a'? Why the introduction of a dash after the 'D'?
Next: M4. Four frame lines, 35-50-90-135. Now we're back in business, picking where the M3 left off. But why so much confusion after M3?
Next: M5. Five frame lines? No, four. But the first M with an in camera meter. Why not call it an MM? Or MM5? Or MM1?
Next: M4-2. Canadian version of M4. Why a dash between the '4' and the '2'? Why not use a small letter 'a' after M4 as with the MD-a? OK, M4-2, second version of the M4.
Next: MD-2. Second version of MD. Now consistent with convention of M4 and M4-2. But again what does 'D' represent? Dummy?
Next: M4-P. Back to the inclusion of the mysterious letter 'P'. But the 'P' doesn't directly follow the 'M' any longer.
Next: M6. Follows the M5. OK.
Next: M6TTL: M6 with through-the-lens metering. Starting to make sense again. However, in addition to new metering, the shutter speed selector now turns in the opposite direction of its predecessors. With these changes it's not really an updated M6. Why not call it an M7?
Next: M7. Follows the M6. Leica is starting to get it right, except this camera should have been M8 as the M6TTL should have been M7.
Next: MP. Oh wait, Leica used this over 40 years ago. Reintroduction? No. Apparently 'MP' stands for 'mechanical perfection'. But what about the 1950's MP? Perfection by definition is unsurpassed. But Leica apparently surpassed its first perfection with the new MP.
The more things change the more they stay the same.