Less “not optimized”, & more “not supported”; IE, accelerations that don’t turn on, because companies like Intel, Broadcom, Samsung, & NVidia, have a long history of only giving preferred partner devteams, prerelease hardware access, much less any peeks at unobfuscated firmware.
Yeah, Sony lost me when they broke my Linux install and degraded the DVD playback functions, within six months of me buying my PS2. Similarly, the last “good” smartphone I had, was the Palm Treo (650p\680p\Centro); since then, I’ve never had a single phone that granted direct hardware access & allowed unloading/sideloading the OS by default.
Manufacturers want deep control these days; way beyond mere root permissions.