My case is the other way around. I look for software in the store, and if I can't find it, then I install from the terminal, but I always update (and remove) from terminal. I'm a diehard Gnome user, but this will certainly make me move to something else.
Now, in flatpak's defense, it's great to keep browsers away from my system, as well as some other inconsequential apps that have no business integrating with my system. I like flatpak's for these use cases. Everything else, I need my RPMs.
For example, Apple has cared about their developers as customers.
Only if by "customers" you are referring to how they constantly find new ways to fuck you over.
All I have to say is: welcome, good luck and have fun.
It is no riskier than any other reverse proxy or tunneling app. If you follow good opsec, you should be fine. In truth there is no bulletproof way to avoid intrusion, so do the best you can without completely doing away with convenience.
Gnome. Love how it just gets out of the way and let's me do whatever I want without interruptions.
Have enough of it, it might get some parts wet.
Stop. Water drowns people. Let's do beer instead.
ElGato is famous for just not working on Linux.
I converted our whole congregation to Linux, and we use a BlackMagic ATEM for streaming over OBS:
https://www.amazon.com/Blackmagic-Design-Switcher-High-Speed-10-Pack/dp/B087D7FLBG/
At first we started with a cheap single input capture card and it worked great:
Or like Fedora (and I'm sure more distros) nicely asks you if you want to update in a user initiated restart or shutdown, and if you say yes it does just that and updates to restart or shut down. My memories with Windows are having to remain in front of the computer to make sure I can turn it off after it reboots multiple times to update.
Winblows 10 did the exact same bitlocker crap to my best friend and attorney.