annoying but surely fixable. In all the time I used my various kindles I never had any book for which I could not fix a missing cover issue.
AFAIK - books bought directly from amazon will never have a missing cover, others - usually epubs - just need a cover added to calibre which conforms to certain rules, then use calibre to put converted epub onto kindle. I don't recall if there's a specific sequence to adhere to, like resize cover, then reconvert book... as I am unsure of the exact under the bonnet mechanics. I am fairly sure that kindle looks for a cover inside of the sideloaded mobi/azw and if it finds one that conforms to its unpublished criteria, then it displays it...
I think I maybe had to fiddle with some covers of .mobi books from humble bundle , but I got them all to work eventually via calibre
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