Bedrockgames
I post in the voice of Christopher Walken
And I honestly find 3E a much bigger jump from the previous edition than 4E. That by itself is presumably enough to defeat the idea that 4E is "clearly" the most different, and as such it should be largely ignored when designing 5E.
i think which one is deemed a "clearly bigger change" boils down to numbers. Not that those numbers are available but if you polled all people who made both transitions and most said 3E was the bigger change, I would grant you the point that its basically regarded as the larger leap.