It was merged because there were no technical objections to the feature.
Alphonse Pace
51

^ A good example of the misinformation I spoke of in the letter. That not everyone needs to create a segwit transaction is irrelevant to the fact that it would be a massive system change. Here are some technical objections https://medium.com/@SegWit/segwit-resources-6b7432b42b1e

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