There’s at least one relatively silent failure mode with attempted drag and drop installs depending on how you distribute the package- this report is if the package is in a ZIP archive:
WISH: Clear Error Message For Attempted Plugin Install from ZIP - Rhino Developer - McNeel Forum
If I were @Tim_Williams I’d test any likely such failure modes (the “windows flagging a file as potentially unsafe” one in particular such as if you company-email the package out to users) before counting on a low friction deployment.