This is exactly the pain my advice helps you avoid. The implicit cost of creating a fork is that future changes higher up the chain could either cause you to be stuck at this revision or give you an additional bulk of work in order to update. Of course anyone can update and run a custom build for their project, but the cost is often not worth it.

It should be noted that the situation where you intend to fork and maintain the project, this does not apply, and by all means make your changes. In the case where you intend to update, this pattern will help you avoid the pain.