Those regulatory roadblocks serve a safety purpose where vaccines are concerned. Trump unfortunately staffed his key agencies with Big Pharma execs and lobbyist types and then massively funded dangerous new technologies being positioned as vaccined and legal immunity being provided to Big Pharma on them at the same time.
Bad judgment? Bad advice? A direly twisted arm? I don’t know.
Trump was in a no win situation. Develop vaccines over several years - “Aha, he’s doing nothing and responsible for billions of deaths!”. Rush the development of vaccines - “Aha, he pushed through faulty dangerous vaccines”.