Hello Harm,
The email providers as they have been implemented were never intended to serve the purpose of connecting end users with a mailbox. They are not intended as a way of integration or synchronization between the Software Factory/IAM and third party email solutions. Instead, they can be used in combination with the Email connector process action to send informative emails from an application, whilst it being possible to include data from said application in the email.
This is not much different from what the SMTP connector has always done in the past, except for the fact that we now also support other providers such as Mailchimp, MS Graph and Sendgrid. Besides that, the providers make it possible to reuse predefined setups without having to set up basic values such as authorization for every single process flow or situation.
In theory I believe it would be possible to add Gmail as a provider type in the future. If you would like to have this option I kindly request you to create an idea for this.
Kind regards,
Renée