I'm surprised nobody else mentioned their stated reasoning: They can't easily focus on bugfixes and improvements when there are two codepaths in production simultaneously. They want all sites on a unified style and code, regardless of what that style is.
I'm surprised nobody else mentioned their stated reasoning: They can't easily focus on bugfixes and improvements when there are two codepaths in production simultaneously. They want all sites on a unified style and code, regardless of what that style is.