I didn't get it either, but this video does a pretty good job explaining why it's different: https://www.youtube.com/watch?v=DMQWirkx5EY
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I switched around one and a half years ago. I must say, there are some hurdles to using NixOS. Mainly I dislike that it always takes around 20 times the effort to start and project. You make up for the initial time investment, because you end up with a far more stable setup, but still it does take some willpower to get things started.
I will switch as soon as I can get proprietary Nvidia drivers to work on my laptop.
SYMLINKS
SYMLINKS EVERYWHERE
(also 6000 packages intalled on my system for some reason lol)
because it's good as hell and i don't want to have to spend time having to rebuild and reconfigure fresh OS installs or risk breakage when I could just use a config file that I know already works
Answering that question fully would require a PHD thesis.
Perhaps you could narrow down your question a little?
I ran it in a VM for several months and was underwhelmed. Sticking with Fedora.
For those who like a video format, I found this introduction quite informative.
I was zzz until i heard having the ability to have different versions of packages installed at the same time without having the flatpak issue of having to have duplicates of the same package.
All-in-one config is definitely something I would've hoped Arch had (I just like the idea of everything user-related stored within /home because that makes fucking sense, no, homed doesnt do exactly that) so I'll definitely check it out if my harddrive ever crashes or something.
I've been looking at it after numerous times I update Fedora only to have some tool break that I use daily. Then I spend a chunk of the day getting Virtualbox working again so I can do my job (write code for websites).
I haven't made the jump, but it looks very interesting.
I've made the jump twice, and jumped back twice.
Conda and any other reproducible computing library that relies on LHS Linux filesystem just doesn't work on it (okay it does, but more as an obstacle)
I'm okay with having nix the package manager on my default arch system though, since it is incredibly useful for cross compiling, and it let's me modify my system however I want.
Have you tried putting it into a buildFHSUserEnv?
I also often put the "dirty" packaged AI/python stuff (which is unfortunately quite a lot) into Dockerfiles if I don't want to package it cleanly with Nix.
I'm using Void Linux and see no reason to move over to NixOS. The concept seems cool though.
I don't get the hype. I'm staying with Arch, as Nix seems to be mainly for developers.
Overlays. Good package management, and lot of stability stuff.
It's been around for like a decade, but was recently make more approachable by offering a graphical installer.
I tried it about a year ago and I don't know it did not convince me. Yeah it might be great for some niche developer oriented needs or deployment but for a normal OS usage, meh. I kind of see it as a current hype, just like crypto/NFT before, and AI now. For normal everyday usage I find openSUSE Tumblweed much more suitable and much more widely applicable.
I'm really not sure of where this would be anymore usefull than a simple bash script to install all packages you need since it doesn't do configs and that rollbacks are supported by some filesystems already. Also Having version specific dependencies is already a thing for flatpacks and such
A simple bash script is not reproducible or deterministic. Also a filesystem rollback is not the same as NixOS's generation based rollback.
Also, NixOS doesn't just install packages, all system configuration is done declaratively, which would be a very bad idea to do via a bash script.