Same, I just saved it to instapaper and read it there.

Isn't identical on every platform is good for a consistent user experience?

The usual argument goes: consistent user experience means adhering to your users’ expectations, which are shaped by their platforms.

hackmd.io has a pretty nice latex supported. I find it much better for math notation than dropbox paper. It also has docker image available incase the service happens to shutdown.

https://hackmd.io/

Backend : Since I am more comfortable writing python, for speed and perf i would go for Sanic, it's pretty similar to Flask with async function. For personal or MVP I would use Flask with Peewee or Django depending on the complexity.

Frontend : React for dynamic page only if i really need it. The rest would simply use any jinja provided by the backend framework.

Database : small project sqlite ( personal blog, MVP ), postgresql for production level.

For extremely fast and simple RESTful setup I would go for loopbackwhich has nice cli with lot's of middleware layer for data manipulation.