I'm sure there are more and very detailed differences, like if the evidence leads to an unsafe vaccine that there are different processes.

I think the major talking point is covered by this info, which is meant for the general public. I'll make an assumption that the general public is also less educated on average than the users on HN on average. A flowchart that would satisfy a bunch of nerdy engineers (us HN users) with all possible paths would confuse the heck out of everyone else.