Fifth Element
Legend
I disagree - what does this information give them? Besides the impossibility of obtaining reliable information on this, how does the knowledge of whether 3E was a bigger change or 4E was help them design the game?I think for WOTC, it is more than academic. This is information they probably want and need.
It's probably fair to say that the two biggest edition changes are 3E and 4E, regardless of how you rank them against each other. Lots of people switched to 3E, and lots switched to 4E. So which change was bigger is academic without knowing if said change is seen as good or not.
Both were big changes, and presumably they met with different degrees of success. That first link Ahnehnois provided suggests that no one thinks 2E's change was anywhere near as big as 3E's or 4E's. So 3E's big change was great, but 4E's somewhat bigger change was bad? Is that what we're trying to infer?
You could argue that fewer people switched to 4E than they did to 3E. You could try to attribute that to the "bigger change" in the editions. But that doesn't take into account the specific changes. Maybe big changes are great, so long as they're well done, and people didn't find 4E's changes well done. Who knows?
It just strikes me as trying to put people into camps. People have largely given up on calling 4E a worse game than 3E, or saying it's "not D&D". There were a lot of people saying that a few years ago, but now reasonable people accept that it's a matter of taste. So now we're on to 4E was a "bigger change" as a way of separating us from them. Many 3E fans seem to want their game included with previous editions while keeping 4E on the outside, while self-identified old-schoolers tend to lump 3E and 4E together outside of their vision of what D&D is.
To me, the degree of change does not matter, so long as the changes that are made make sense, have a purpose and are well-designed. I don't care how far 5E ends up being from 1E or 3E or 4E, if I like it the best I will play it the most. And it will all be D&D to me.
WotC is presumably trying to make the game reasonably close to all previous editions, to try to include as many players as possible. To this end, the relative degree of difference between 2E/3E and 3E/4E is irrelevant. Previous editions are what they are, and they all need to be considered.