The original design philosophy of the PC was as a plug-in-play device. Everything was designed to be friendly to new software, new hardware, and new integrations. The whole point was to give you a device that was a programmatic multi-tool.

The advent of computers as a financial vehicle radically changed that design philosophy. Once you could extract money from a computer owner, the open and extremely mutable hardware/software became a massive financial liability.

Imagine getting handed a wad of playdough, having all sorts of fun with it, finding all sorts of useful household applications for it, and filling it into every crevass in your house. Then imagine someone showing up and saying "We're going to use the thumb print you leave on the playdough to verify all your future payments and assignment of future debts." Suddenly, a burglar can walk off with your entire bank account if they can scrap a bit of thumbed playdough out of a corner of your house. And - oh, whoops - all your door locks and window jams are full of playdough, too, because it was so damned useful for customized security.