It's a bit weird. Usually it's recommended that one update things, but when it comes to the SDK Manager, it seems the general recommendation is to ignore it, unless somebody (typically Erel) tells you to install something.
My mental model is that Erel downloads the SDK to his computer, does some unknown things to make it play nice with B4A and then uploads it to the site. If one update this SDK, things break, because the SDK doesn't look like expected. No idea if this is correct, it's just my mental model to explain the situation.