MrSatan I concur. Collected and used ethically, data can make huge improvements without compromising privacy.
Personally, I am planning a blockchain based double blind study to help me design cannabis strains. This will allow me to fine tune different gene expressions to create strains that will have specific purposes for different types of people. For example, as a high functioning autistic I want a neurotropic strain with mild pain relief and anxiety reduction effects that won't send you to the moon, chain you to the couch, or increase your food expenses. I know of someone else that is hypersensitive to THC who could benefit from a social anxiety relief strain.
As for why I would want it on a blockchain; I would be distributing the seeds to other voluntary growers who would also have to record the conditions in which the plants are grown. The participants will report their experience through a website. A blockchain will ensure the data integrity without me being involved in 100% of the production or distribution. It may take a few years, but I believe this methodology will spread, adding the benefits to many future cannabis consumers and patients.