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DeckSet, but I miss being able to create my own template, for example to add a small logo in a corner to follow corporate guidelines.

Same! I rarely use it anymore, but was always very pleased at the Deckset functionality.

Is this a creature comfort wrapper for reveal,js?

I doubt it uses reveal.js under the hood, but, yeah I think they can effectively do all the same stuff! I just like it because I tried reveal.js (disclaimer, a while ago) and found it kinda fiddly whereas the macOS-native UI of deckset was nicer to use

Does Deckset support Latex?

It does!

https://docs.decksetapp.com/English.lproj/Formatting/08-form...

(their docs are also quite good in my experience)