I've never used another init system, but i see no problem with systemd. The declaritive approach makes things very robust. Surely some things can be improved, but it's a good tool.
Edit: Also managing user services the same way is nice.
If you want to protect the system from untrusted software with containers be careful. Containers and images are mostly an abstraction tool to run and control the applications. Not saying it's not possible, it's just easy to make it insecure.
No. It's only about the kernel itself, not Linux Systems(aka Distributions).
Earlier the kernel did only consist of C code, but for some time now the option to develop parts of the kernel in Rust is being worked on. In the end it both compiles to native machine code, meaning the running kernel does not require the Rust toolchain to be present.
Interesting that there is a flatpak build as well. I knew it was possible to run cli programs with flatpak but this the first programm i see that explicitly lists that as an option.
I've never used another init system, but i see no problem with systemd. The declaritive approach makes things very robust. Surely some things can be improved, but it's a good tool.
Edit: Also managing user services the same way is nice.