In your opinion, which FOSS software is by many considered "old" or "obsolete", but are in fact, in your opinion, in many ways better than the newer alternatives?
Honestly, if the FOSS community wants better adoption of these technologies, there needs to be an stronger emphasis on presentation and UI/UX.
The general public isn't interested in using something that looks janky, behaves glitchy, or requires fiddling with settings to get looking nice.
Say what you want about that, I'm not defending it. I think people should care more about content and privacy/freedom vs just shiny things, but that isn't the world we live in right now.
The big tech corpos know this, companies like Apple have become worth trillions by taking existing tech and making it shiny, sexy, and seamless.
Maybe that is just antithetical to FOSS principles. I don't know what is the correct approach. All I know is I've heard so many folks who are curious about trying out FOSS software give it up because they encounter confusing, ugly, buggy user experiences.
Some FOSS products have figured this out, Bitwarden, Proton Mail, and Brave Browser have super polished and clean UX and generally are as or more stable than their closed-source counterparts.
Sad truth. I'm super happy with my FOSS experience overall, but I'm also a techie and very open to tinkering with stuff.
OP, I like several of your examples though. Lots of the old school tech is really solid. Just needs a clean fast front end in many cases.
My choice is Vim and its variants. Add some plugins, it's a really great way to write code. I have no interest in GUI IDEs anymore since getting my NeoVim installation set up and tuned.
Linux will never be main stream popular unless it becomes pre-loaded on major brand laptops and computers, however good the desktop enviroments and apps are. This is the thing that doesn't get much talk, but however seemless and easy to install most modern Linux distros people just aren't installing their OS' in the first place. Most people either get their OS pre-installed or ask their local Geek Squad to do it for them.
One issue is that Microsoft makes so much on data collection, that they actually pay manufacturers to put Windows on there, it's one of the methods used to try to keep stock computer prices low. While this is scummy and anticompetitive, it helps the consumer and gives me a chuckle that installing Windows inherently decreased the worth of a computer.