It seems obvious that the distinction between buying a game digitally and buying a license to play a game digitally could be confusing to the average person looking at a digital storefront. Are you being facetious? (honestly asking - like, "gee, who would have thought there could be confusion?")
Steam has never offered offline installers. And even offline play requires you to be online for offline to work for a period of time before being online again. If the service disappears so does your catalog.
I thought it was common knowledge you’re only buying a license to play via steam. You never own the game outright forever.
A lot of Steam customers simply haven't thought very far ahead: what happens when they die? As a twenty-year old company there is certainly a reckoning on the horizon as their users age-out and start passing in higher numbers.
What happens when Gabe Newell dies is another very important question that adds some urgency - one or two decades - to establishing more balanced policies.