It's because of how limited they are. Companies gave up trying to add stuff, and are in fact removing stuff and sensors in an attempt to up the sales of watches, earbuds etc etc. As long as it sells , they won't bother with better improvements
>>seydor+(OP)
If I could plug them into a keyboard, mouse, and monitor setup and be running a full fledged OS they'd be exponentially more interesting than current. Their usefulness is hindered in their current form. Yes I know about Dex.