It's depressing knowing you own a license to access the digital file you purchased but that contract can be withdrawn at any time.
Besides you cannot replicate the same authenticity by showing your film library to friends and family when you sit down and scroll through your digital purchases.
I actually think that you don't lose much going from physical moves/tv to plex as most people are super used to scrolling through streaming, but man do I miss having big cases full of books. Handing someone a kindle to scroll through is a lot less fun lol