I'll be a bit harsher. It's not that technologies "become obsolete" what really happens is that the industry is susceptible to fads. One fad ends and it's time to go to the next, even if the older technology still does exactly the same thing.
Web development, for example, has just been one fad after another, even though many of the newer frameworks don't do much more that the stuff we had 10 or even 20 years ago.
Some even complicate things, because you wouldn't want to do it the "old" way.
It's a bit of a fashion contest rather than engineering.
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I'll be a bit harsher. It's not that technologies "become obsolete" what really happens is that the industry is susceptible to fads. One fad ends and it's time to go to the next, even if the older technology still does exactly the same thing.
Web development, for example, has just been one fad after another, even though many of the newer frameworks don't do much more that the stuff we had 10 or even 20 years ago.
Some even complicate things, because you wouldn't want to do it the "old" way.
It's a bit of a fashion contest rather than engineering.