You seem to equate the mind blowing trial and error of blockchain to normal R&D trial and error but possibly I misunderstood you.Ok, so glad you accept that trial and error helps us to advance technologically. Not sure why you threw your hands up at it initially, though.
As regards what the trial and error involves in cryptocurrency, it isn't what you claim. Firstly there is a whole host of stuff that is being worked on - far too long to post here. You talk of miners and cryptocurrency yet there are many significant projects in cryptocurrency and blockchain that don't involve miners. There are also proof of stake based networks where the mining overhead is not as resource intensive yet there are other significant trade offs. i assume that you mean't proof of work and Bitcoin rather than cryptocurrency generally.
As regards my understanding of blockchain, I'm not a cipher punk, a cryptographer or a developer. I don't come from a professional background when it comes the nuts and bolts of blockchain. However, I don't have ANY insecurities in asking someone to explain something. Please clarify what it is specifically that leads you to believe I don't understand blockchain?