The confirmation came from the Steam support staff earlier this month when Resetera forum user delete12345 asked Steam support if he can put his Steam library in...
There is nothing that Valve could change about this with the current way games are licensed.
All your Steam account is is a collection of lifetime leasing contracts between you and the seller. Steam already forces third parties to give you liftime access even if the game is pulled from the store page, but that contract gets voided once one of the two parties ceases to exist, be it the buyer or the studio that sells the game.
Legally binding the games to your account instead of you also isn't possible since in most countries you either have to be a real person or a registered entity to form contracts.