It's not about resources, it's about convenience. GUI is the most natural interface for human being. By the way GUI was on purpose designed to replace old fashioned command line one, since GUI is the most convenient and the most natural way of interaction between man and machine.
This is total rubbish, and you've simply betrayed how little you know about human-computer interaction.
While there
certain situations where a GUI may be the best option for
certain people, this is
far from universal. My job is to manipulate computers all day, every day, and switching from command line to GUI would absolutely destroy my productivity. You need merely look at people complaining about Tesla cars to see that a GUI can be much worse even for "regular" people.
So, you may use your old machine in many tasks, but it will be a painful and ineffective way of doing things.
Well, it seems that many people here consider late-'80s and '90s computers to be "vintage," so that's dead wrong as well. In the mid-90s I was using a Sun 3/60 (released around 1985, though running software 5-8 years newer than that) as my work-from-home machine. My current desktop environment is essentially the same.
My personal experience was that the eraser-nubbin was a time-loser while the thumb-operated track pad (centered below the space bar) was more efficient than a separate mouse or trackball. But still not as efficient as keeping the thumb(s) positioned over the space bar. YMMV.
It depends on exactly what you're doing with the pointing device. I find the TrackPoint ("nubbin") far better than a trackpad for most uses, but my primary use for it is to switch focus in a point-to-focus system, so large moves don't need to be particularly accurate. It also works better for me for precision work such as selecting text (though not as well as a mouse, which has its own separate costs), but I suspect that is more about what I'm used to and trained on, rather than something inherent in the TrackPoint or trackpad designs themselves.
When I need to do a lot of precision work, such as schematics and PCB layout, I do primarily use a mouse.