Thank you dear MileStone for giving me opportunity to explain word SUNNAH.
Word Sunnah is from root SEEN, NOON and NOON. It has many meanings eg path, tradition, habit, age, era, formula, rule, law etc etc.
1)The fact is that people live as they live each according to his own nature or personality.
2)No two people are alike nor are they expect to be.
3)It is not possible to know each and every move of anyone ever.
4)It is not possible to have information about anyone to each and every minute detail
5)It is not possible to transmit vast information perfectly.
So any information of this nature cannot be called sunnah of the prophet because most of such information does not even exist.
The quran telling us the life of the prophet is best example for us to follow cannot mean this because the quran was not sent for us to do the impossible. So anyone who interprets the quran in an impractical way is misinterpreting the quran.
Even in the quran there are verses which according to existing interpretations tell us that certain things were only and only for the prophet and not for his followers. This tells us very clearly that the whole life of the prophet is not an example for us to follow.
The other factor is the changing world in which we live ie we all were born babies but we did not remain babies. So things that change with time and place cannot be defined as sunnah either.
All these things force us by way of reason to define sunnah objectively. So the question is what is sunnah purpose wise?
The only answer is that Allah sent the prophet with his mission like a king sends his general for a battle to the battle ground to fight the war.
The question is, what role his followers ought to play? They are supposed to learn his goals, ways and means and help accomplish the goals. The followers are supposed to be supporters of their prophets ie they are supposed to help them do what they came to do. Like children help their parents or army helps its general win the battle.
This has nothing to do with kurta pajaama or pagdi per se because a man has to wear clothes. People live as they see their societies living. The fight is all about what is right and what is wrong and why?
In this context if we have to do things we should do them the right way ie we must have right goals and use right ways and means to achieve them.
Now coming to beard it is not the sunnah of the prophet at all rather that is the way his society used to live. All he did was told people to do things such a way that they look right and good. You wear clothes but ensure they fulfil their purposes eg they cover your body, they are nice and clean and and they look great on you when you wear them.
You have a beard then look after it ie don't make it look terrible on you because that will reflect badly on your personality. You wash your beard, comb it, trim it properly etc etc.
I hope my explanation helps understand the definition of word sunnah.
Thank you again and all the best.