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Because of smartphones, pocket TVs were never a thing.
(lemmy.world)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
But it's only ever been niche. Or gimmick is probably more appropriate
So really its:
Because of primitive battery technology, ubiquitous pocket TVs were never a thing.
I disagree, the watchman and clones existed into the 2000s and were tech found in several households. Ours ended up with some of the tornado kit so we could get news broadcasts in power outages and other emergencies.
Gimmick/niche isn't an appropriate description for technology that was superceded by smartphones, even early ones.