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@Heathside Boy - theDucks was responding to your experimenting with drag/dropping a cover into the ebook viewer. As you found it achieves nothing - the ebook viewer is a read-only version of the epub.
So your only options are either to do a conversion (like you documented) or to use the Modify ePub plugin. I would argue if you work with ePubs the plugin is the more "economical" way, because there are situations where you don't actually want to do an epub->epub conversion. If you aren't careful when you do a conversion you can screw up your book - you need to carefully review your settings before you go ahead. And even then calibre will still do some bad things to some epub conversions, resulting in changes to the book that may not be desired like splits in places you definitely don't want them, margins being removed where you don't want them to be etc.
Whereas Modify ePub does not touch the ePub structure or css styles (outside of what specific options you choose) and hence is a "safer" approach. However it should also be said that Modify ePub is not always able to replace the cover as it uses the same logic as "Save to disk" does and needs the cover to be "identified" correctly within the ePub. Maybe one day we will make that more inclusive to guarantee a cover will get in there but thats just the way it is at the moment.
So basically if you want to shut your brain off and insert a metadata jacket/update a cover, Modify ePub is the least mental effort. But if you want to guarantee the cover is inserted inside, you currently have to do a conversion (and accept the risks of doing so).
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