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The problem is that it is a trade-off between saving electricity and having equipment that last longer. Laptop tends to have a relatively short life-time, and when something (screen, keyboard...) stop functioning, it is not easy to replace this part, especially after the end of the warranty. So people tends to buy a whole new laptop. Building and getting rid of electronic devices have great environmental costs (how much pure water to make a processor).
A CRT screen is by far less convenient than a flat panel, but the latest is not nice at all when it comes to dismantling.
It's not much of a trade-off in practice - at worst, you just use it until it fails. I think most units don't fail throughout their life, and people still get new ones (too often because "old computer started to be broken & too slow" aka just filled with crapware*)