I was thinking, wow, something wrong with installing KDE and stuff like Konsole/Dolphin/Konqueror? If you use KDE on Linux, KDE on FreeBSD works the same.
Networking in jails - yeah, OP really should have paid better attention to the blogs on klarasystems.com. Even IPv4 network stack can be finicky if you don't get the basics right.
RTFM, then KISS.
FreeBSD can do everything Linux can, and then some. Hell, FreeBSD beat Linux to ZFS integration, and even the Ports Collection was an inspiration to Gentoo's Portage.
I've been daily driving FreeBSD for years, close to a decade now. And I'm writing this on a Lenovo IdeaPad 5 2-in-1 laptop that has a Ryzen AI 445 processor. And yeah, KDE works fine on it, I can even watch Youtube.
But no, OP really should learn to follow the official documentation, which is the FreeBSD Handbook, and not rely on cursory glances at secondhand info from Youtube. Otherwise, it's gonna be an ugly experience all around. :/