Libhybris is great for making a tech demo. I wouldn't base a product on such hack, anymore than sell Linux laptops with ndiswrapper...
If something doesn't work in the binary android drivers, the vendor won't help you (we support only android, sir). Nor can you fix the drivers yourself, because you don't have the sources or the knowledge how drivers work.
All the phones sold with Sailfish OS & all the officially supported Xperias used libhybris - same with most unofficial ports. While not ideal, it works reasonably well - saying that as someone who has been using a Sailfish OS device as primary phone since 2013.
"and yet, it works". To this day my Jolla is the best phone I had, always fluid and reactive compared to much more recent and powerful Android phones. I don't remember any driver issue with it.
If something doesn't work in the binary android drivers, the vendor won't help you (we support only android, sir). Nor can you fix the drivers yourself, because you don't have the sources or the knowledge how drivers work.