I feel like when an important message comes in out of sequence, but you had already sent a response to the chat with what was visible at the time, it will be very confusing when that gets reordered.

Ex:

A@T0: User X is abusing our service, we should send them a sternly written letter.

B@T60: Yes, I'll do it right away.

C@T2 (received later): No, we should just shadowban them.

When B sent their message, their intent was clear to them. But when they review their message after C's message is received, if the display ordering is changed, the meaning of the communication has changed, and how can B show that sending the warning was reasonable when they clearly said they were going to shadowban the user. (Maybe this group should use something else with a guaranteed ordering to track abuse and response, but that's a different question)

If C's message is displayed earlier than B's in some cases and not others, that makes for a confusing situation, but each person can look at their messages and easily see what they saw when they argue about a breakdown in communication in the aftermath.