Usually the better pitches have a discussion on risks/challenges to overcome, and how you are going to use the current VC round to do that (and the timeline, etc). "Big risk item is delivering T tech by D date, requires P person for M months (usually a specific person), who we will hire at time T_1 after getting our funding round"

If most of the VC's concerns are on your list of challenge milestones, then they will be more likely to believe the rest of your pitch as being accurate.