Except that out of that experimentation came Alyx. Everything in that game is outstanding from a technical perspective, the way you interact with the world feels completely natural.
Sure they could have pushed out a VR game every year for the last 5 years to maybe get to the same level of interaction fluidity but they would all feel subpar, not quite there, like the vast majority of other VR games.
Valves strength is that they a have a structure that allows experimentation without a hard deadline, they can afford to throw millions at the wall and see what sticks. This allows themw to take a decade between large, ground breaking projects. They're not beholden to YoY or QoQ growth.
They've had what? Two duds in 20+ years? Not bad when you consider the rest of their output are beloved classics.
Granted they have a good few money printing machines to help them work like this but I would argue that they have these money printing machines because they have the ability to experiment, because of their structure.