Those might all be true and it's understandable why nobody wanted to support all that long term, but that doesn't mean people should abstain from developing their own languages and platforms, just because it lead to nasty code that one time at Fog Creek. And it's a "failure" that - from what I can tell - was a pretty good business decision at the time. But even if you discard that, even if you assert this was nothing but badness with no upside whatsoever, it would still be a learning experience.

When a rider falls off a horse, they have to make a decision: abandon the idea of horse riding ("riding your own horse rarely makes sense"), or apply that as a lesson to your skill set and re-mount. While there is nothing wrong in deciding that, upon reflection, horse riding was not for you, I think it's harmful to go out and announce to the community that riding your own horse rarely makes sense and should be left to the pros. Because what you're left with then is a world where the only riding is done by dressage performers.

(Sorry, that analogy got a bit out of hand, and admittedly I know nothing about horses, but I hope the point is still discernable)