While I think that some guys around 'overrev' a bit in their reactions, there's something true and reasonable in them.

We may assume two categories of updates (regardless if being free or not).
1) the ones necessary to make the product work or to fix major bugs and flaws
2) the ones adding features and options

We saw a mixture of those two categories on some service packs. E. g. 4.3 gave us Navigraph support, 4.4 added the weather radar and so on.
But, you guys are correct, some parts of the updates always had to fix more or less vital things on the plane.

With 4.5, a 4.6 was needed because 4.5 mixed up quite some systems and rendered the plane unusable at some ends.
So that 4.5 to 4.6 update was needed and therefore clearly category 1 for example.

So, even as a big fan of CS aircraft, I'd say it's a bit too easy to summarize all updates as the ones in category 2.
I'm thankful for all the added features, some are noted above. But we shouldn't communicate clear cat 1 bugfixes as 'updates a customer has to be thankful for'. That would actually miss the point in my eyes.