Again speaking as a layman, I think the thing to realize is the physical scale on which these things can occur. Some of the relevant blood vessel diameters can be measured in microns - just big enough for platelets to flow. What is incredible, is that these problems don't happen more frequently.
One-offs can occur, but there is the issue of repeat problems with larger vessels, so yes, I would want the best prognosis/guess of the future dangers available. Trouble is, it's doubtful anyone would want to stick their neck out on a specific case.