Hey @ereckers,
Blocks CSS is a child plugin of Otter Blocks, and we also make it available as we think some people might want to use this functionality without wanting to have the entire block library.
And Blocks CSS is not alone, we also have Blocks Animation & Blocks Export Import which are all part of Otter Blocks but we also make them available as standalone plugins.
To keep the process simple, we deploy them all together as new versions so every time we make a release, all of them are released together hence sometimes you will get releases for one plugin where there are no changes to the code.
We know it can be confusing but this process allows us to maintain all of these projects together without the additional hassle of maintaining 4-5 plugins separately.
Hope it answers your question.!