Modern fortran has classes, too! I've occasionally joked that fortran 25 and python 4 are to be the same language...

“I don't know what the language of the [future] will look like, but I know it will be called Fortran.”

— Tony Hoare, 1982

I assume you say it at least a bit in jest, and with a good deal of sincerity.

Did you ever know an interactive environment for producing Fortran code? Anything like a REPL?

In development, but there is lfortran: https://lfortran.org/

The next step after type annotations will be having the type specified by the first character in the variable name.