At least from technology perspective (not social perspective), Bitcoin protocol and few of it's implementation (such as Bitcoin) has been thoughtfully tested and used more than 10 years. I wouldn't use term "experimental" for 10 years old protocol and software.
I think only mass adoption would make it non-experimental.
Even then, you could argue it's still an ongoing experiment (like literally capitalism and communism themselves; both are mass adopted and in a way still experimental).
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FYI, you should quote @20kevin20 since he's the one who made the statement (while the other one simply copy/paste his post and add few enter).