That's why I made Stempad, which is meant to rival the speed of pen-and-paper for scientific writing. I've currently added 7 different scientific blocks (and several basic blocks too) and plan to continuously add more.
Questions are welcome, and preliminary feedback or constructive criticism is really appreciated!
(If you're on mobile or would prefer to see a demo, here is one: https://www.youtube.com/watch?v=U-9j8sFIkS4)