Modern PCs can trace their lineage all the way back to the IBM PC Compatibles. Multiple vendors across the industry consolidated on a set of standards (because IBM basically had a monopoly at one point), and consumers came to expect that these standards would be followed.
When smartphones came on the scene, there was no expectation for them to follow desktop standards. It was the Wild West, and every manufacturer ended up doing things at least a little differently—much like the early PC market, actually. The customer base was the general public, not the hobbyists and tinkerers who bought into the early PC market, and there was no regulatory pressure to adopt open standards. In addition, I don’t think people anticipated the extent to which they would become the dominant form of computing for much of the globe.
infinitevalence@discuss.online 3 weeks ago
Because of capitalism & companies that dont want your phone to have a life after use.
That said, some do. Most Motorola devices can have the boot loader unlocked, and all Google Pixel (and nexus) devices can be unlocked.
The next problem is the closed source BLOBS from companies like Qualcomm who make the majority of the ARM cpus in these phones. Even though they are ARM they are not standard enough to run without some propitiatory code that is obscured and encoded into the firmware.