It’s slow but stagnation is a disingenuous way of putting it. https://www.google.com/intl/en/ipv6/statistics.html
NAT brings no security, especially in this scenario. If you want to prevent malicious software from opening ports, you use a public facing firewall on your gateway. Which you should have for IPv4 as well.
They made that and it’s called pure functional programming. Take a look at Haskell
I run Postfix, Dovecot and rspamd on my server. The configuration is here: https://git.dblsaiko.net/systems/tree/configurations/polaris
There’s also the Simple NixOS Mailserver project which is an abstraction on top of these and has a few more things. I’ve never used it myself though.
Of course, you also have to set up all the standard email setup like DKIM, DMARC, SPF and so on here.
Gradle is pretty awful actually, I’ve had to deal with it for years when I was writing Java. It’s pretty much the #1 reason I’ve stopped doing anything Java related.
Meson is the well designed option for C family languages. It also has support for Java, Rust, Swift, and a couple other languages. C is the most well supported though I think.
It also has a built-in dependency downloader that respects the system installed packages (and therefore distro packagers).
Swift is pretty close. I’ve been trying it out recently after writing years of Rust and it’s been great so far (and pretty much completely eliminates the big tooling complaints I have about Rust…).