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This is very rarely the case. Almost always they come across some draw back, that makes it completely impractical, and 5-10-15- whatever, years pass without anyone overcoming said drawback.
Cancer treatment also has had lots of improvements but they aren’t newsworthy if they’re not the Cure to Cancer™️
Yeah, lots of people do not realize it is not one disease, it is unregulated cell growth, of many kinds, caused by many diseases.