Meanwhile I use Onenote. I don't have to worry about keeping notes safe, or the stress of trying to type at warpspeed. I would go with a Remarkable tablet but now with subscription pricing it's a non starter.
Those beautiful graphs now… I ended up using secondary programs to gen images (pdf or whatever) of graphs and such for latex to bring in the usual way. Not as good!
I live-LaTeXed notes for a couple of years in undergrad but eventually went back to pen + paper (approximately all my assignments continued to be typeset, though).
For speed with, e.g. matrices like you say, but also more specialized course specific notation, could you build a set of quick functions for the topic of the day to aid note taking?
If set up your environment just so, you can repurpose really simple commands like the slash in “\this” to do some common but annoying thing like bold upright lettering or underbars or something. (I actually need to go look at latex to be sure what all you could make maximally parsimonious… it’s been a while and I mostly copy and paste my old commands around. Anyway, you probably already do this kind of thing.
The benefit of having typed notes at least for me come from being able to search, having a good record of my own understanding of a course and also not having to rely on keeping handwritten notes safe. They also look pretty which is a bonus for studying from them.
Examples:
- Analysis I (which have been edited): https://adamkelly.me/files/ia-analysis-i/analysis-i.pdf
- Graph Theory (not edited but diagrams added): https://adamkelly.me/files/ii-graph-theory/graph-theory.pdf
As a side note, one other thing I do is write short 'handouts' on topics that I think I have something to say about. For example https://adamkelly.me/files/handouts/direct-products/direct-p....