What benefit? Most "inventions" hit the world @ large as soon as products incorporating them are released. Same world @ large gets the details after someone pokes around in those products & figures out how they work.
That is practically always before patents expire.
Truly smart innovations will survive over time. Obvious "inventions" are often trivial enough to be "invented" independently again & again.
Patents mostly add a load of red tape, and a big stick that large companies (& patent trolls!) can hit smaller companies or individuals with.
Overall benefit to society, even if patents work as intended? Debateable (and forever being debated, eg. between economists).
In a small society, an inventor taking solution-to-big-problem into their grave, is a problem. In a world with 8 billion+ souls, not so much. Someone else will repeat what 1st inventor didn't release into the world.
Companies innovate because they want to grab market share by getting there first. Losing 'protection' doesn't stop this process. It just removes that big stick that would-be competitors are beaten down with.