I don't know about anybody else, but some of the reasons why I think the conviction isn't a secure one would be...
the misuse of statistics where the jury was shown a chart that implied that LL was the only person there for every incident
the fact that none of the deaths were thought to be suspicious initially
the lack of transparency over how which cases were chosen
the number of different supposed methods (and changes of method/time to fit the narrative). Also the somewhat questionable nature of overfeeding and liver injury with the force of a car crash without leaving any other damage as murder methods.
the lack of anything except weak circumstantial evidence
the door swipe evidence which, when found to be incorrect, was apparently not a problem for the prosecution
the conditions on the ward - by which I mean the lack of consultant rounds, the poor hygiene, cramped conditions, lack of expertise and understaffing etc. which could have meant that babies whose condition was deteriorating were not noticed early enough or treated appropriately
the selective use of the post it notes/diary evidence
the way some of the circumstantial evidence was not put into context - for example the Facebook searches, which turned out to be 31 searches out of a total of over 2000 and handover notes as "trophies", most of which didn't relate to the babies in question and the painting of this as some kind of motivation.
the fact that what she was wearing when she was arrested was even mentioned by the prosecution
the "almost caught red handed" not calling for help by Dr Jayaram when his own email appears to contradict this
the fact that when any of these is examined and found wanting, the argument seems to be that whatever it was was not relied on in court, it was all the other things.
the fact that the people coming out to say that they think there's a problem in this case are not conspiracy theorists but statisticians and highly respected medical professionals.
It's not because I think a nurse could never possibly be a murderer, or because she's pretty/not pretty/blonde/blue eyed or I think she was a brilliant nurse it's just that on a ward with some really serious failings, there's a much simpler explanation.