We say dont use MCPatcher because it injects its code into random/wrong places even if you tell it not to. So its just easier to say don't use it then to deal with all the hassle supporting it would be.
Same goes for ModLoader, if you install shit wrong you fuck things up, its not needed and should not be used with forge as all modloader functionality is supported in FML.
So you should never need to install modloader, at all, ever.
As for ModLoaderMP, it is antiquated crap only used by people who don't know anything about coding. It had one job, and it continuously failed to do it properly so it was replaced by FML.
And lastly, Bukkit, the Craftbukkit team had made it clear they do not wish to play nicely with Forge so unless things change Forge will not officially be compatible with bukkit.