Honestly, I could do and have done Unreal, Unity and (easily) Godot development on less!
But that's the minimum to spend for a very comfortable experience, I'd say; RX7900 and GTX 4090 are only there for bragging, while an on-board GPU would not be comfortable running game graphics in my opinion but I've seen people do it and not complain :/
FWIW Matrix and XMPP are also decentralised, much like e-mail is, which is why I recommended it.
I'm immediately skeptic about SimpleX's premise of having no user IDs; they'll likely need some unique field for each user, this might as well be a UUID or something like that... So what's the benefit?
Linux Mint
GPU: AMD RX7600XT
CPU: AMD Ryzen 7 5800x
RAM: 16GB DDR4
That's surprisingly mid-range, I don't think I ever see that; just budget specs or bragging-level specs.
As someone with almost the same build (Ryzen 7 4700GE, RX7700XTX, 16 GB DDR4) I'm positively surprised!
As far as brands are concerned, replacing with Japanese alternatives is just as, or even more, valid as European alternatives; but that's not for this sub.
This XKCD?