Applause should be an emotional response to the music, rather than a regulated social duty.
We should welcome applause whenever it comes.
The sheer force of the music calls for a wild audience reaction.
All of us love applause, and so we should - it means that the listener likes us!
Mozart often wrote to his family that certain variations or sections of pieces were so successful that they had to be encored immediately, even without waiting for the entire piece to end.
Everyone is different. Sometimes it's very exciting; sometimes very scary.