Too much invented bs
I guess the writers found the real Leonardo boring, so they added a preposterous investigation plot that is useless and irrelevant.
The series shines in the brief moments where we see his genius at work, when he interacts with other ones like Michelangelo, or when we discover some true but less explored sides of his personality, like how inconclusive he was, or his relationship with his father.
The rest is quite weak and uninteresting. Matilda is kinda wasted.