When we debate the definitions, what we really are debating is, "is this amount of change worth a new series of physical books"?I have to ask ... why are we still arguing over this?
The definition of "edition" in D&D is completely arbitrary, and designated by the company. Editions in publishing aren't the same thing.
And it's not about interoperability or compatibilty. OD&D and Basic (Holmes) and Basic (Moldvay/Mentzer/RC) and AD&D (1e) and AD&D (2e) are all interoperable. But they aren't all the same "edition."
See, e.g., my prior attempts to discuss interoperability of TSR-era D&D and trying to do a new taxonomy of it.
Heck, what even is a "half" edition (3.5e)?
Is this a New Edition? Well, speaking of new editions, Bobby Brown put it best when he said, "Whitney, let's go party!"
Um, no, when he said....
Everybody's talking all this stuff about 5e (now now)
Why don't they learn to forgive?
Hasbro don't need permission, make its own decisions
That's, that's Hasbro's prerogative
They say it's a new edition, Crawford really don't care
That's Hasbro's prerogative
They say Hasbro is lying
But we don't give a damn
Getting money is how corps live
Some ask Crawford questions, what do you want to conceal?
But they don't know history
They really don't know the deal about the past changes
Filled with anger and spite, from wars so long ago
But Hasbro will win this fight, sing
Everybody's talking all this stuff about 5e
That's, that's Hasbro's prerogative (I'll tell you why)
Hasbro don't need permission, make its own decisions
That's Hasbro's prerogative
It's Hasbro's prerogative (it's Hasbro's prerogative)
I agree that the strict definition of edition is arbitrary, but whether we have enough new content to warrant a purchase is a more tangible debate.