Agreed 100%, particularly the thing about thin fonts and lack of contrast. I'm 27 years old and I had to turn on the accessibility option "Increase contrast" on newer OS X versions to avoid getting headaches; so I went back to Mavericks. My next computer won't be a Mac, I'm not interested in using an OS that causes me literal pain. Seeing that Windows is going down that route too with terrible and blurry font rendering in Windows 10 seems like the only option is Linux, where at least you can adjust the UI to suit your needs.