Having a fondness for more dynamic geographical territory and having lived in plenty of neighborhoods with dogshit reception, I do think landlines becoming relegated to Extinction is greatly unfortunate.
I think wood and glass should be used more in just about everything, I'm not the biggest fan of plastic for both environmental and honestly reliability reasons.
It's difficult to answer this as a real sci-fi junkie, I really like the idea of progress forward, and that sometimes technologies have been mothballed or replaced entirely because we've developed something new, more efficient, better. If it's more energy efficient or more reliable or more effective, it should be used. I think a great deal of the problem with the computerization of everything is less about the computers themselves and more about ethical concerns and environmental ones. I think given good policy, better planning, and ceasing to focus on profit as a goal, technology could be a huge step forward in reducing our impact on the world, but I'm rambling at this point.
I think what I miss the most is not necessarily any particular technology but a line of thinking, that things should be sustainable and reliable, that's Parts should last a long time to have 40 50 60 70 year service lives. It's the waste that upsets me the most.
Also to spite the long brigades, bring back push mowers. If you're going to do the tiny little environmental disaster that is maintaining a lawn in the White People sense, you should have to do that mother fucker by hand and not have a shitty fume-spewibg engine or be sapping any power from the grid. [Insert 2 hours of complaining about lawns here]

