Is there a good reason we should not create new customer records as users (vs. leads)?

We have a lead gen process where consumers are providing us with qualification information so our customer success team can interact with them. We are using Zapier to feed this data into Intercom. We want to be able to crate events for these new customer records (such as Calendly events and the information from the lead form).

(As best we can tell), Zapier allows for the creation of events for Users but not for Leads. Looking at the Lead vs. User definition, Leads are a more accurate description of these consumers. However... if we can't use Zapier to append events to leads... is there a good reason we can't use User records to track these consumers?