A form service would have to (incomplete list): * read from or change db records, possibly not self contained (directly accessing WP tables) * be generated fr

A form service would have to (incomplete list): * read from or change db records, possibly not self contained (directly accessing WP tables) * be generated from a schema that allows for both frontend and backend validation * said schema might be generated from or amended by db records * authenticate with and talk to arbitrary external or internal services * write to and read from the/a file system * have an authentication and authorization scheme, possibly maintained via sessions * send formatted email * ... So depending on where the service sets its boundary, it becomes either useless or too complex, when the alternative is to just write a module in PHP.