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When version control was new and when dvcs's were new, there was a lot of controversy. And the period when something is 'new' and controversial can be quite long, but people tend to forget and history tends to repeat itself.

> you could also use the degree of controversy as an indication of just how off the idea is.

That's exactly the ad populum fallacy, so while you could do it, you probably shouldn't.

Not quite. Ad populum describes the position that a proposition is true based on its popularity. Having doubts of a proposition's truth is not the same thing.

Using the degree of controversy of an idea as a metric for "just how off the idea is" is exactly using the popularity of the proposition which is negation of the idea in question as a metric for the truth of that same proposition, and so is exactly the ad populum fallacy.

| There's a difference between a few people arguing and a controversy.

Only on average. We are fully capable of being irrational as large groups...