... and you never will, since OSes don't provide anything like that out of box and to make design ecosystem work like that, a major effort for fat clients would

... and you never will, since OSes don't provide anything like that out of box and to make design ecosystem work like that, a major effort for fat clients would be needed. In a time when dev tools are mostly free (apart from intellij idea but this approach has its own drawbacks) and focused on other technologies / platforms.