Why computers are not reliable

Computer technology reminds me of female model shoes, which is disposable and has no practical application, except to carry beauty.
So the computer constantly requires attention, software updates, upgrade, additional technical specialist. The usual thing that everyone uses and such is not reliable. I still remember the first slogans, iBiEm compatible. But there was no compatibility. Something was coming up, something was not. Here such trouble with it. Yes that far to go. The same Steemit, works slowly and is not reliable. We live in the 21st century, and the computers slow down. They do not correctly calculate their capabilities.