Isn’t Lemmy suposed to be FOSS? I thought that was the main reason why people left Reddit for Lemmy was that and API changes. Wouldn´t other FOSS be of interestt too? Just a thought.
Linux is usually light compared to windows, and no nonsense bloatware and faster to run. Plus is customizable.
If you are a lawyer I assume you are looking for stability and prefer simple over complex. So my guess is that Debian(since is the most stable rock solid distro) would suit you, and most importantly is the desktop environment, if you are looking something similar to Windows I would choose KDE Plasma and if you like MacOS interface then Gnome. Both of them are very different but customizable, I find Gnome is simpler and less busy and Plasma is full of features but busy IMO. Oh and Cinnamon desktop environment is best of both worlds I think. If you are concerned about security and encryption then I’m afraid I can’t advice you on that. Finally I recommend looking up in “distrowatch” if you are looking for something most specific, most distros come with Libre Office as some of the comments point out. There are some distros specifically made for business wich I would recommend if you go big.
Here is a post I made of my desktop with Gnome so that you can see how it look and feels.