Right, but you were spending four hours doing Library maintenance or options tweaking, which makes you a power user no matter what. Like I said, I basically agree, but I can see how others could think the existing scheme would be good enough.
Let's not forget what the Library Backup is actually backing up.
Using my friend Steve as the example, he wouldn't care if the backup was from four hours ago or four months ago, because he hasn't changed the config since I helped him set it up, essentially at all. He has imported media, of course, but that's not really what the library backup is for. The important tag data is all synced to the file tags and sidecar files. Auto import will just reimport them and he'd be fine.
And if he lost the media itself, then the library backup is useless. Backing up the media is obviously out of scope.
If you're using files that don't allow embedded tags (very rare and high end), have embedded tags disabled (non-default and ill advised), use views that depend heavily on Date Imported, are constantly tweaking the Library setup (views and whatnot), or playing with DSP settings, I think the argument could be made that you are something of a power user.
We're basically talking about Playlists for most people, and that's it.
Again, I could go either way, but obviously it isn't the simplest change to make for whatever reason, or they don't agree, so... Meh. The current system is pretty good, and now easy enough to extend.