Tor is not a implementation of I2P. They are 2 different technologies with different usecases.
Tor ussage nodes and hops to obfuscate trafics origin while I2P obfuscates the entire network layer. With I2P every nodes IP is know to every node. Wile this is not the case for tor. Thirth hop doesnt know the IP of the first hop.
Also tor is heavily used to access the clearnet while I2P is not designed with clearnet in mind.
While on one hand Manjaro is very polished. Some things they do is questionable. Like the time they suggested to change your date and time because they let their repo keys expire. Or accidentally DDOS the AUR. Just to name some. The Manjaro team has a rather bad track record of these things.
I know that you can change the aspect ratio somewhat in jellyfin. but it also often leads to subtitles being half or completely off the screen. is it possible to play from jellyfin true vlc?
Their are not many programs that require open ports for incoming trafic. Things like ssh or a web server do. But then again those are services you would manualy want to open anyway.
Honnestly. Firewalls shut be enabled by default. Specially on laptops connecting to public places.
A good default shut be choosen by the disteo maintainer. A default shut not overwrite your own config. Like any config really. So no upset folks that like to change the firewall. Also if you dont block much outgoing trafic you are not likely to run into problems. And for people that like to poke holes in the incoming trafic. Your a “advanced” user anyway.