"[...] and authenticate it against the user account not the hardware I will never know. 30p per disk and they last 25 years minimum.
The weak link is then the authentication service or its agent on your current device. They are outside your control and can be changed or disappear.
Nothing is immune to this passage of time. There is often a personal consequential loss when you are told "Sorry - we no longer stock/make those any more" - and the current equivalent requires you to scrap your perfectly adequate dependent system.