While others have brought up cultural reasons (mostly just change taking time), there is also a scientific/technical issue with innovation in general: scaling.
This is true for almost any big “scientists have invented X” news. It’s one thing to show off a tiny sample of the thing you’ve made, it’s a completely other thing to come up with an effective, economical process that is able to produce 1000s of tons of the stuff, without requiring obscene amounts of workforce, space, energy or raw materials (all of those are typically non-issues in exploratory research).
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