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Here's my proposed fix for bug #457. It only removes Twitter links (because that's what Twitter does) and it prioritises Twitter media over external links and only loads 3rd party images if there is no Twitter media (because that's what Twitter does - see https://twitter.com/YorksWildlife/status/693132495122989056, which links to Flickr but has a Twitter image, not a Flickr card).
I think this balances the problem of removing URLs from the middle of tweets (especially when Flickr images are web pages with comments, etc) against the problem of duplicating images, while still loading plenty of media.