Ticket management is stuff that needs doing, obviously.
Diagrams are illustrations; if something is so complicated it can only be understood with a picture, it's too complicated. But a quick diagram on a whiteboard (or with a pencil on the back of a fag packet) might be helpful.
Presentations (with slide-decks) are for managers[0], not engineers. They are a huge drain on time. I got severely dinged by my manager for doing a presentation without a slide-deck; I hadn't prepared one, because I had real work to do. But I think I showed my manager up, because all the other engineers had turned up with slide decks.
A crap slide deck is quick to make, and completely useless. A really good slide deck can take days to make; it's a specialist trade, like making good user documentation. Slides must augment the presentation, not distract from it.
[0] I've been forced into formal management once or twice; my experience was that at least half of management is bragging to other managers about how important your team is, and slide decks are great for that.