@khughes HubSpot forms load using javascript on the page to load the latest version of every form. Javascript is not allowed in any emails, thus in the current state of forms it’s technologically impossible for us to add a form to emails.
Forms in email in general is technologically quite difficult and currently has very low support and functions very inconsistently. There’s further information on this along with a breakdown of what is compatible here: Do Forms Work in HTML Emails? | Campaign Monitor
For the moment the compatibility and realiability of this is too low to justify the work required to rebuild forms to be compatible with email. However this is something we may consider in the future if the compatibility of forms in emails improves.