Been using it for a while, and am pretty happy with it. It has some nice features, and works pretty well for me, so I’d recommend giving it a try. I believe it, unfortunately, doesn’t support OVPN though. But as I understand Wireguard are to be preferred over OVPN anyways.
I am not sure how well they stack up against the competition, as I haven’t really used them, but maybe they can hit the sweet-spot:
KDE has an office suite: Calligra. Windows and macOS support seems to be preliminary, what that means in terms of stability/performance, I don’t know.
As you also mention Figma working decently for you, you could take a look at Penpot.
In regards to your latex situation, maybe klatexformula, could be something for you. It generates images from latex. I’ve been pretty happy with it, in tandem with word processors, before fully jumping to latex. It’s pretty lightweight, their site does mention it needs a minimal version of latex though, which I don’t recall installing when using it, but both texlive, and miktex seem fairly small.
Edit: as others also mention OnlyOffice might also be an option for you.
Can share some of my favourites
Just begun exploring using:
Btw, I believe Obsidian isn’t FOSS.
That’s an amazing moment you’ve captured, thank you for that ❤️