A couple of years ago my elderly parents got feature phones with KaiOS. It was slow (at least on those devices), cumbersome, and some basic things such as SMS f

A couple of years ago my elderly parents got feature phones with KaiOS. It was slow (at least on those devices), cumbersome, and some basic things such as SMS felt quite unintuitive and complex to operate. Think old feature phone OSes where you have to navigate from one menu to another with arrow keys, a few buttons and limited screen space, but without the relative polish of those actual old phone OSes from the days when they were standard. And with tangible sluggishness added. n = 1 and I don't know how much phone vendors customize KaiOS. Maybe it was only cumbersome due to customizations or limitations from that vendor. Maybe it works better on touch devices. Maybe the hardware just wasn't up to the task. But it didn't leave a good mark.