I guess it is much more frequent to maintain internal patches rather than doing all the merging work into upstream, especially the feature is non-trivial. Mergi

I guess it is much more frequent to maintain internal patches rather than doing all the merging work into upstream, especially the feature is non-trivial. Merging upstream consumes more time externally and internally, and many developers are working with an aggressive timeline. I don't think it is fair to criticize them because they didn't do ideal things from the beginning.