Some of the Galaxy A series phones might also get the 3 years of Android OS updates, same as what Samsung did with their flagship devices. A customer representative from South Korea recently said that the 3 years OS update may also apply to some of the Galaxy A series phones.
@crazyboy A50 is the only A series phone that is on monthly security updates list. So it makes sense A50 should be getting it over A51 or A50s. Also A50 is the largest selling Android device till date.
That saying, it is definitely upto Samsung to decide.
