If I describe this as an IDE in the browser that runs in debug/breakpoint/interactive execution mode by default, how wrong am I? The interface also reminds me

If I describe this as an IDE in the browser that runs in debug/breakpoint/interactive execution mode by default, how wrong am I? The interface also reminds me of RStudio somehow. My own preference is to only use notebooks as an exploratory tool, debugging tool, or to make presentations. For any longer code or serious project that I'll write I'll stick to my traditional editor (emacs/vim/etc.). Call me old-fashioned?