I use both - Arch as a primary desktop and OBSD for my servers.
For all practical purposes you are correct.
I personally think of Arch as a collection of components loosely put together, you pick and choose what you want and they generally work together, there are no releases per-se, stable or otherwise.
OBSD is a more coherently designed and engineered system, if you want a particular feature that is available in a new release , the logical way to get it is to update to a new release. If you don't want it , you can simply stay on your release and just apply the rare security patches that come through.
For all practical purposes you are correct.
I personally think of Arch as a collection of components loosely put together, you pick and choose what you want and they generally work together, there are no releases per-se, stable or otherwise. OBSD is a more coherently designed and engineered system, if you want a particular feature that is available in a new release , the logical way to get it is to update to a new release. If you don't want it , you can simply stay on your release and just apply the rare security patches that come through.