Mine is that the useState hook is an actual plague on the entire React ecosystem. Regardless of your opinions of React, if you wanna use something then use it right.
If you're sharing graphical elements then I prefer pdfs when you know it's final, and you want to make sure people see it how you intended, and you want it to be vector format. Similar thing if the information is some complex format/layout. People can zoom in instead of having their device messing it up.
But I agree on simple contents like documents, tables, and such