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But they likewise don’t record what the installed applications create afterwards. Removing an entire package is equivalent to dragging an .app to trash. The only benefit of these installers is that they can install components in multiple locations at once, including locations that are off limits without root access.

This is what I meant. Pkgs are no better or worse than an app bundle when it comes to leaving junk around (if you know what you are doing).
 
I like to use AppDelete and double check with App Cleaner and before hitting delete on any of those I triple check with a great little program called "Easyfind". If the first to leave anything behind Easyfind finds it but in most cases (9 out of 10 times) the first two get everything.
 
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