Old-school visual basic, but maybe powered by python or another modern scripting language.
https://anvil.works is VB6, but for the Web, and in Python. No JS frameworks required! We've had data scientists with no Web experience produce MVPs with it in a couple of weeks.
That being said, the VB6 runtime is STILL in Windows 10, and therefore will be officially supported to a degree for at least 5-8 more years. How’s that for backwards compatibility.