This is now implemented in the 'deb-scrub-obsolete' command that is shipped with lintian-brush. By default, it will remove obsolete maintscripts entries and versioned depends that were unncessary since oldstable.
I'm considering whether it would be possible to run this as part of lintian-brush as well, so I'm keeping this bug open for now. -- Jelmer Vernooij <jel...@jelmer.uk> PGP Key: https://www.jelmer.uk/D729A457.asc
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