There are now multiple options for GUI editors. When I was using the Mainframe in 2016 through 2020 I was using multiple eclipse based IDE's that provided the ability to edit datasets on the Mainframe, submit and view jobs, etc. They couldn't do everything you could do in the ISPF interface but they made the Mainframe much easier to use.

I was actually rather fond of the editor in ISPF by the time I was done with the Mastering the Mainframe course.