Earlier quoted context omitted.
Apple is obviously following the innovations of web app design here. People use web apps with wildly different designs all the time, and yes, there are some usability issues with that, but when consumer OSes were first being developed some decades ago, HCI researchers assumed that everything had to look exactly the same between applications or users would freak out. The web never had a single HIG, so we found out tha…
People use web apps with wildly different designs all the time because there are no UI standards and there is no basic toolkit. It's a bug, not a feature.
I'm not sure that's right... would the web have caught on and be as well-loved if everything used "system" colors and designs? Maybe you're envisioning something different, but I'm not sure where the middle ground is between the web as it exists today and a classic Windows 3.1 / Mac looking app - what would a "basic toolkit" look like beyond the HTML elements and form controls that we have?