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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.
The biggest contributor is actually screen size. Your phone screen is about 8x larger and 16x higher resolution than an old dumb phone.
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