The problem for me is... I love simulation games (love Rimworld and Prison Architect for example) but the Dwarf Fortress learning curve is too much for me. I've attempted a number of times and learning it just was not fun for me at all. I want to enjoy good simulation games, but I don't have enough free time to force myself to play something that I don't enjoy until the point where I've learned it enough to enjoy it.

For instance, the lack of fidelity of the game allows any new character to be added in 2 seconds

I get this and actually completely agree. I loved MUD's back in the day because they could be so much more complex and detailed because they didn't have to worry about graphics and whatnot. Rimworld and such also can do a lot more than fancy 3D games for the exact same reasons, so there's definitely a spectrum.

But having said that, I still find the DF UX to be almost unapproachable. It could be low fidelity for the reasons you mention without being quite so hard to learn and internalise, but I get the impression that its just not a priority for the dev at all. Oh well, its their choice, but I feel a bit sad that I'm missing out on an otherwise amazing game.