True, but Apple also toned those down over the years and relied more and more on text. The sidebar of Finder, for instance, used to have coloured icons. Now they are all grey and fairly indistinctive when looking at a glance. Same with iTunes (see above).Except people do not just rely on text. Other visual cues should be accounted for, e.g. the thumbnails in System Preferences, the 'usual' position of the setting you want to go into (memory), etc.
The text in El Capitan is not illegible to most people, but if you indeed have legibility issues I know you are not making it up and Apple don't think you're lying as well. That's why there are Accessibility settings.
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But don’t you agree that the text is more legible that way with that contrast? Why not use the slightly darker text colour as the default? I can not imagine that anyone would complain about it if that was the default text colour from the beginning. Apple is always so uncompromising when it comes to these settings. Want more legibility? Well, let’s screw up all translucent interfaces and buttons while were at it.