Well, your statistical quest is drawing some bogus results probably due to the sample size.
I have been working on MBs for 30 years and have fixed less than 2 a year. Probably about one tenth the amount of wheel bearings I have replaced.
Every German car does this the same way and there may be a new problem with late model units that have more than one sensor and maybe some more problems in Ca. When I think of common failures over the years the amount of fuel gauge problems wouldn't even be on the screen.
I not jumping on your bandwagen.
Bosch Master, ASE Master, L1
33 years MB technician