I regret I wasted several hundreds on products now belong to InMusic. Issues you mention are my main reasons I'm moving away from plugin based VIs.
Plugins, their installers, their license managers are operating system level programs that can do anything to a computer. They can (and do) spy on you, they can lock you out of using the product (activation/licensing errors), or they can directly harm your computer (like the iLok BSOD issue).
Kontakt libraries are just bunch of files you download and move around; they live in Kontakt without access to your computer. If Native Instruments vanishes tomorrow, we can just find a portable version and continue our work.