Web forms make it easy to collect information. They're particularly well-suited for surveys where individual submissions are less important than the overall corpus of data collected. But, when the identity associated with each submission matters, like in the case of a grant application, understandably users want confirmation that their data has been received properly.
It's best practice to either have a step where users can confirm what they're about to submit, or promptly send an email with a copy of the data that's been submitted, so they can follow up if something went wrong. By giving applicants a paper trail, you help put their nerves at ease and reduce the number of people reaching out for manual confirmation.
Don't settle for tools just because they're the easiest to setup. Use the technology that best addresses the needs of everyone involved.