When someone makes a change to a custom form on a project, the project team isn't notified and there's no history of changes unless it's a tracked field, which we know is limited to a certain number of fields and is hard to find in the Updates. This has caused so much confusion and incorrect work being done for our company, it's a real problem I'm sure other Companies have as well.
To help with this, add versioning to custom forms on projects where a history of each custom form version is accessible somewhere on the project (e.g. Documents). Also allow for project team members to be notified when a change has been made to a custom field.