UIs on the web suffer much more than UIs elsewhere from the disease of people designing their own UI elements in order to achieve a novel, unique style. Perhaps, some day, this will be considered pointless and unprofessional like on the desktop...
But web design philosophy has been creeping on to the desktop for quite a while now. Apps like Skype and Slack are ludicrously overstyled these days. Flash and chrome have always played teeter-totter with utility and functionality, in every field.
