Hardware wise i think getting better if not better than mainstream eg samsung.. its only the software issues tak syok.. samsung still wins on this department.

Durability, quality of screens, cameras, speakers, some processors on par with samsung flagships or using flagship snapdragon chips. Just the implementation in software i think samsung is still better. For example foldable phones, samsung multi screen and multi tasking is much better and use of hinge/flex function is better. Cameras, sometimes processing in china phones not on par with samsung and apple, also software despite the sensor is good. of course google integration is too good to pass.. unless you're living in china.