I expected PCs to be in every home pretty much forever. Now a lot of non-tech people prefer phones and tablets.
Curious, aren't phones and tablets essentially just smaller personal computers?
they are not the same thing
they do less; the software is restricted, especially on iOS, there are _rules_ set out by the manufacturer about what is acceptable in software on the platform, both thematically and functionally. An app generally can't interfere with other apps, it can't be a dope wars style game about drugs; there are a lot more caveats, but I am far from aware of them all. For a long time you couldn't get a compiler or interpreter on iOS, so you couldn't use your "computer" to make more software... so it wasn't general-purpose at all, since you by definition couldn't change its purpose without the ability to make new software.