[agumonkey]

I'm no math professional, and my struggled around some math topics was rarely notation, but 1) a bit of hidden information/culture (which can show in notation too) 2) a misalignment on what the topic was trying to achieve.

The last bit which I can't describe clearly is 'maturity'. Sometimes an idea just eludes you for years, until it doesn't. Changing maths would probably not have fixed this.

Oh, and the underlying human feelings behind the problem solving made by others. It seems that a lot of maths is lowering energy required to express or find a solution, no matter what subfield you work on, that seems to be the goal.