In Europe, especially in the large cities, where the majority of people use to frequently "bump" the others car when in line parking (i.e.) you might be less susceptible of getting a broken pinion in your gearbox...
The hand break (correctly set up) should be more enough to immobilize the stationary car, IMHO, I leave my car in gear only in freezing winter or after a track session (even if I always do a cooling lap).
By the way, as others on this forum have already mentioned, expressing your opinion (even half joking) in the M2 section is almost a given privilege, M2 future ownership seems to be highly (fortunately non exclusively) associated to self-righteousness and not only...