Another thing to consider is that when you're accused of something that is essentially abstract and relies on expert witnesses on both sides, it is incredibly difficult to prove your innocence. Even if you get as far as reasonable doubt, there will always be a question, because people question how and why such a situation has come about and become the subject of legal proceedings. The "no smoke without fire" scenario.
We want to trust that any investigation prior to trial would be incredibly thorough and unbiased, however, human nature being what it is, there will be bias, perhaps subconscious, perhaps not, especially in highly emotive cases.
Court cases are not implicitly about the truth, it's more a game where each side is invested in winning. Those who find themselves as the unlucky contestant / defendant, if they are new to the system, and have no reason to distrust it, find it incredibly difficult to grasp this. Your legal advisors can tell you how certain things are likely to go, as they have been here before to different degrees, and you will think "But they can't do / say / use THAT, surely?" But yes, yes they can if it is presented as pertinent. Pyjamas come to mind. Utterly crazy making and substantially irrelevant to Lucy's case, but an exercise in discombobulating and destabilisation of the defendent.
In cases where actual evidence is largely circumstantial, discrediting the defendant is a huge power play. The prosecution has to convince the jury at all costs of guilt, by fair means or foul in the name of "justice" (to justify a spendy high profile trial). The defence has to get to reasonable doubt, and I do think questions need to be asked about Lucy's defence.
That said, we're talking about exceptionally complicated medical evidence. Not many solicitors / barristers would necessarily know where to look for experts with the right expertise in a highly unusual case, where the mechanisms of death proposed have little precedence.
I don't blame the jury. They did as instructed - which was basically if you think she did one, you can find her guilty on them all, never mind how. That's what I think is a travesty.