Great topic for discussion but the article does not address how it's a "Scare Tactic"
Slashgear should have listed all the associated concerns with "Fragmentation" and why it's a concern including Hardware, Software, Apps, Screen sizes etc. It's not a simple subject really but has some very valid concerns and buyers need to know.
Cas had a froyo device, we just upgraded her phone to a mid range Samsung that has gingerbread. During the time she had froyo I can think of only one app that she wanted (not needed) that wouldn't run on froyo. When she moved to the new device everything transferred.
I call BS on "fragmentation" honestly. Sure, one user may have gb, another froyo, another ics. Truth is only a few apps aren't comparable at release of an os but it takes a very short time for devs to catch up. The SDK for ICS was released well before it hit. Add that only 2 devices currently sport ICS officially yet most apps are comparable. Development communities spur wide compatabiliy because there are ROMs for other devices that push them to update their apps.
Add this: A good bit of normal users don't even know the differences between froyo, donut, gb, or ICS. Bet even fewer can tell you what they have. If it works, and their apps work, they don't care.