Badly discoverable? Sure. You can vastly improve the remembering part by picking appropriate mnemonics. The Plan 9 keyboard file is a nice start, I think.
It follows a set of rules so you don't have to remember a large number of sequences but can often guess the right one intuitively.
ASCII digraphs for mathematical operators give the corresponding operator, e.g., <= yields ≤.
Greek letters are given by an asterisk followed by a corresponding latin letter, e.g., *d yields δ.
It’s pretty good IMHO. Greek symbols are all obvious. \Omega and \omega for upper and lowercase omega etc. Super and subscripts with ^{} and _{} also work with \sum and \int for indices and intervals.
Software like Latexit and Mathpix also help a lot.
It follows a set of rules so you don't have to remember a large number of sequences but can often guess the right one intuitively.
https://github.com/9fans/plan9port/blob/master/lib/keyboardhttps://9fans.github.io/plan9port/man/man7/keyboard.html
There's a program (mklatinkbd) to convert it to a format usable with X11.