Some of the more popular MLs will receive 100+++ wechat messages everyday, it will take some time for them to scroll to u & it's very unlikely that they will scroll to read every new messages coz they noe many are rubbish, trash, nonsense & useless messages, as such, many messages are missed, therefore most likely many new wechat requests are unanswered
Juz like sometimes u read posts from bros here that they hv 100+++ PMs in their inbox so they may or may not reply u, meaning u may or may not get the reply
Both analogies mean the sane thing
..