I have a channel with +700 subscribers, it is really hard for me to browse my own messages (I also do this to resend old messages to new members) because the chat is full of “Member Foo added” messages, because several people join every day:
btw, this message is also a bit weird “Member Foo added” for a channel it would be more natural to say “Foo joined the channel”
it would be better if it said “Foo, Bar and 99 others joined the channel” and if you click the message it would list the people that joined