Jacob1-- the new Issue Tracking template in Modern view does have email support (enabled by default in "list settings," "advanced settings"). Emails are sent when the "Assigned To" field is changed (including on creation of the record if a valid address is entered there). When an item is reassigned, both the old and new person are notified.
I just switched an old custom list over to the new Issue Tracking template just for that reason (to get rid of a custom SP 2013 workflow that sent the emails). I'd like to have the ability to customize the email as we could with the old workflows. I used a trick: all emails in the new Issue Tracking list start with "[Title] has been reassigned...." I set the Title column in all new records to "A call" -- So they all start with "A call has been reassigned."
Even without full customization out of the box, it would be nice to have a checkbox for each column to indicate whether the column should be included in the email or left out, and also the ability to cc someone on every email.
Jim