Nothing has fundamentally changed.I remember first buying the 13” 2018 pro and then later returning it for the 11”. I found that unless I wanted to use it as a full time computer the 13” was just too big and heavy to use as a tablet. Hopefully that’s changed a bit with the 13” being lighter but I still usually use my 11” in a keyboard laptop set up and find the screen plenty big enough.
I did the same as you, and felt that wasn’t the right screen ratio (roughly 4:3) for taking notes because it’s so much squarer (nothing like paper), and wasn’t rectangular enough in landscape mode to do split screen well as a laptop. Single apps did look better when you didn’t split screen, but at the time, I often had a Word document open beside a PDF, or a PDF beside another PDF.
Even for movies, they didn't look any larger on my larger screen. The larger screen meant there was more black space above and below the movie. 😅