Buttons without any visible frames - do not provide optical lines to be aligned with other screen elements (look more chaotic on the screen) - are visually mo

Buttons without any visible frames - do not provide optical lines to be aligned with other screen elements (look more chaotic on the screen) - are visually more difficult to find on the screen (enhances stress, makes work mor tiresome) - are more difficult to aim at with the mouse (requires more precise movement, error prone, leads to frustration) - are more difficult to be identified a active element (violating rule of discoverability) In many cases there is no good color choice either. Quite often you have dark grey on light grey or other combination low on contrast. Things described in the article were part of fundamental knowledge in system ergonomics 20xrs ago. After "UI" or "UX" designers took over usability went downhill on many screen. Today the most elementary rule of good design is commonly ignored ("Form follows function").