I quite agree that "WAITING LIST 排名不會輕易被叩門信影響". As per my last year experience, I sent around 10 叩門信 to 港同. But finally 都係無被admitted.
叩門都叫做有機會 (0.000001% 都係機會), 吾叩就無機.
Among all the interviews, my son loves 港同 the best (I believe his performance is not bad as he can tell me >90% of the interview content, how he answers ... etc. He says he feels very happy during the interview and is eager to study at 港同). This school is the only one which he has such a good impression. But unluckily ....
Anyway, my son and me still like 港同 very much.
P.S. We sent around 6 叩門信 to another school and got admmited in June.