To my opinion, it’s necessary to be carreful with the bot service...
It can easily give the impression that there is not human people behind the community management
I really do not even like much idea of bots as I believe there is so little they can do when it comes to giving an answer to certain questions and request, but all the same, it is not a bad idea when used in a very little way to at least, keep the community engaged and give information on the things that keeps going on.
For instance, just like what the OP pointed out, there will always be discussions, with people from different time zones, so the idea of trying to pass across a message and just assuming that is it, is not a good thing. It is always important to keep spreading that message over time, for new people to see it or possible pin it to the page and in this case, bots do help a lot.