The First Presidency letter on Oct 6, 2018, was pretty clear about the 1st/3rd and 2nd/4th Sunday schedules, without any exceptions for Stake/General/Ward Conferences. Of course each local Stake has discretion, but I would expect that it's generally true that most units are following this and no clarification is needed. But perhaps exceptions are more common that what I'd expect...I'm assuming, somewhere the Ward Clerk designates which calendar weeks are RS, MP, YM, and YW and which weeks were SS.
One aspect I like is that the shared attendance calendar helps give a broader picture to individual organizations (and of course Bishoprics). So when the RS enters their attendance for sisters, they can also easily see the overall weekly attendance of those sisters. Given the fact that without a weekly class for the different orgs it can be difficult to identify trends, having this all presented together gives a better overall understanding of each member's attendance patterns.