If power or internet goes out, wired VOIP phones won't work. Both the power and the internet have way worse reliability than the copper wire telephone

That’s nothing inherent to phone lines, though.

Nothing prevents regulators from mandating fiber or cable providers to offer backup batteries as part of their ONTs and CPEs as well as fiber nodes.

Yes, it would be more expensive than not doing it, but maintaining a completely separate last-mile communications medium is not free either.

Maintaining all these generators, batteries etc. is probably at least as expensive, especially given that you can only charge so much for a landline these days, especially if you’re competing against voice over IP or cable that’s effectively free in terms of infrastructure.

If redundancy is a concern, mobile phone networks are probably much more economical except maybe in very sparsely populated areas, and provide coverage for road accidents as well.

If we can't have real light bulbs, and we can't have real telephones lines, is there a name for that?

I'd call one an actual safety concern (if no alternative is available) and the other nostalgia.