Because portable audio is a niche market which for most parts holds a shorter life span than mainstream products (Apple for example) the levels of stability and dedicated time involved stabilising a product 100% are less. Many of these companies aren't huge, far from it. I'm sure if iBasso or AK wanted to it can be done, just a matter of time, then everyone will be whining because the next new shiny DAP isn't out. Imagine it isn't easy. What these products do offer though is much better SQ, features, than a lot of mainstream MP3 players.