The scientific method is to prove the reality of our world, by reproducibility, verifiable by everyone constantly, as are constantly verified, the laws of electromagnetism, discovered by Faraday and Maxwell, each time we use n any device, TV, phone, GPS, nuclear, etc.
Again you are in confusion! It is enough that an invention is made and tested (even if only once) for it to be considered concrete and therefore achievable. The fact that it is not achievable by others, it is clear from the protection of the invention to maintain its exclusivity and therefore the trials for copying which ensue.
Tesla was an inventor and not a businessman which earned him to exploit several times "scalded cat fears cold water".
but a work of patience, careful, thorough, accepting reality with great care, so that it is reproducible,….
This is where you still confuse, it should not be reproducible by all THAT if the invention is and remains protected and its author living, unfortunately it is hardly possible now considering the costs of filing European or global patents.
…. By everyone, understandable and consistent, verifiable at all times, paying attention with great care and rigor, not to mix everything wrong, as I constantly see on econology, with in addition the refusal to make the necessary efforts of rigor and understanding of centuries of scientific work.
Here again another confusion, most of the inventors have groped with successive failures to the key, including for those that you quote. You confuse invention and industrial exploitation which is the final stage; between the two there are generally imperfect and therefore "unscientific" prototypes according to your terminology.
Apparently, you never invented anything!