I typically do not attend Koha IRC meetings due to the time table. I also do not attend the developer IRC meetings because, at the dev meetings which I had previously attended, the discussion was so technical in nature that I did not feel that I had any valuable input to add to the discussion. Maybe things have changed since then and I should try attending them again :-)
For me, it’s just a matter of timetable. I have a toddler, so dev meetings outside of my work day are impossible.
But… I don’t think there are many Australians with the same limitations as me, and I don’t think we have many active East Asian devs in the same timezone, so I’m mostly resigned to never attending dev meetings.