This depends heavily on what you call "high quality". If you go by Victorian chimney sweep standards, even the crappiest jobs today are heaven on earth.
Staring at screens may damage your vision, posture, sleep and sanity but as you note it's probably not as bad as soot wart, phossy jaw, shoddy fever, black lung, etc.
40%? That seems high.
This depends heavily on what you call "high quality". If you go by Victorian chimney sweep standards, even the crappiest jobs today are heaven on earth.
Staring at screens may damage your vision, posture, sleep and sanity but as you note it's probably not as bad as soot wart, phossy jaw, shoddy fever, black lung, etc.