Since you apparently work in the business you need to be honest about this.
Jenner got lucky. He made an observation and decided to roll the dice on a hunch. Not unlike Trump and hydroxychloroquine. Pathogens were not well enough understood for him to even be certain WHY this worked.
We are extremely unlikely to stumble into a COVID-19 vaccine in this manner. Indeed there are no guarantees one will even be found at all. Witness Tony Fauci and his failed thirty year quest for an AIDS vaccine.
That is not to take anything away from Jenner and his place in the history of science.
It's the difference between a discovery and an invention.
What’s your point??
Scientific achievement is often the result of mistakes (the transistor) and negatives that led to something else
Medical advances have often been the result of keeping an open mind. Alexander Fleming could have just tossed the spoiled sample away and we might not have had no antibiotics for another several decades. Barry Marshall noticed that most patients with Ulcers carried the bacterium Heliobacter Pylori in their gut and treated himself with the bacterium. The history of medical advances is rife with examples of doctors who thought outside the box. Were Fleming and Marshall lucky ?