Separate the administrative from the judgemental
The single most useful distinction when buying is between assistants that do administrative work and assistants that offer judgement. Administrative work means summarising, drafting, extracting and noticing absence. Judgement means telling you which deal will close or which lead deserves attention first. The first category is dependable because it operates on the text in front of it. The second depends on your history, and history is where small businesses are thin.
This is not an argument against scoring. It is an argument for treating a score as a way to order a queue rather than as a fact. Used that way, even a mediocre score beats arrival order. Used as a forecast input, it produces confident planning errors.