Touchpad driver that isn't outright physically painful to use
Progress in assistive technologies, font rendering, display technology and resolution rather than shipping hardly readable traditional Linux-style dark-blue on black terminal themes on today's dark default themes coupled with a lack of easy configuration
Actually working power management, and actual power efficiency resulting in 10h running times (despite overreaching stuff such as systemd, the developer of which has now left for MS to feast on INIs)
Focus on end user functionality rather than endless new developer improvements and abstraction frameworks for self-inflicted problems (snap/flatpack/Docker and other meta containers rather than fixing ld.so and glibc or just use static linking) when new apps aren't coming anyways
A feeling that the desktop/Finder and UX is evolving and respecting habits rather than being restarted with every release
State of the art commercial apps for media production rather than 90s apps struggling for compatibility as devs turn to new playgrounds