Although JDA does respect ratelimits, it would be a good idea to have a command to disable messages from being bridged to Discord when the chat is spammy. For example, /advancement grant Technoblade everything would spam the Discord channel with messages faster than the bot could send. (You wouldn't do this normally, but this is just an example of a spammy input.)

Alternatively there could be a mechanism to send multiple chat messages in one message, like with console messages. I don't know if this is implemented already.