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PC speed gains erased by modern software
(hackaday.com)
This is a most excellent place for technology news and articles.
Cell phone batteries. Phones used to have shit batteries but they would last 3 days because the software running on it was minimal and the hardware was low power. Batteries have become way better in the last 20 years but phones don't even last a day because if all the hardware and software running super demanding and inefficient programs.
Part of that is just us using our phones more. If I used my smartphone the way I would use an old flip phone, the battery would probably last a few days
The biggest contributor is actually screen size. Your phone screen is about 8x larger and 16x higher resolution than an old dumb phone.