Why didn't the dream of a laptop upgrade slot take off?

The problem with laptops has, at least in recent years, been one of expandability. Once you buy a machine, youire generally stuck with it, unless youire willing to take it apart with repairs that have more in common with surgery than mechanics.Part of this has to do with the complexity of our modern machines, but a bigger part is the fact that, simply, upgradability has become less of a concern for manufacturers.But there was a time when laptop upgrades were a big deal - and that time was the 90s.Here's the story of PCMCIA, an acronym only a 90s laptop owner could love.I used a PCMCIA network card on my BeOS laptop (in 2001 or so), since the on-board network chip didn't have a BeOS driver. Good times.