When I first installed calibre its device scanning prevented me doing things in Autocad, the latter would lock up, probably that was Autocad's fault, but at that time Autocad was a critical application and its one I've used for ~20 years.
I don't keep many 'books' on my tablet and phone - about a dozen reference texts, and half dozen transient 'current books', so I don't need calibre to 'manage' them, hence they're ignored.
I'm also adverse to things that happen automatically with no opt-out. Automatic scanning would probably be acceptable if I used a dedicated ebook-reader, but not for a GP device like an iPad or Android. My photo downloader doesn't scan my phone when I plug it in, but only because I have it configured to scan and download on demand.
BR
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