Why Google has been only making .1 updates.

I personally believe its cause of the fragmentation issue regarding which everyone has been crying bloody murder. I believe they're trying to get as many phones on 4.0+ from where the upgrade path is really simple and will be simpler going further, and I also think that Google Play services was introduced to further bridge the gap in functionality.

What are your views regarding this perspective?

Update : again with 4.4, this is extending a bit too much, isn't it? Though 4.4 did have some user facing changes.

What do you guys thinks?