There are things were wastefulness is warranted, like storage redundancy. If one wants data to survive, then it has to be distributed all around the planet.

But the hardware - primarily CPU and power requirement of modern computing is absolutely insane. How can a modern box with all the latest hardware feel not just slower, but so much slower than a PC from 1993, or an 8-bit from the 80’s while using many times more power and space?

Not to mention all the technology and resources required to design and build the thing.

While honestly almost everything can be achieved with power of a Pi or an old Android phone, if only the software is optimized.

And then all the ewaste from making everything disposable and irreparable. Wild.

I think this is a very important idea. Not only because of potential collapse and to conserve resources, but also because in your technological civilisation it is a near certainty that future generations will have to deal with legacy technology and software potentially hundreds of years old that are serving vital functions. Thus thinking now about how such systems could work in the long term and developing hardware and software with that in mind is IMHO quite vital.