Why? Because it considers itself with substances in general and not with products lifecycle. I'm all for controlled disposal and recycling of short lifespan products in mass distribution like cell phones, toys, PCs, TVs and white goods whose time to dumpster is dictated by fashion of the day.
Professional equipment with lifespan going into decades and then some is a different story. How many avocado green refrigerators (these were fashion of the month sometime in the 1980s) will go to the dumpster before you dispose of your custom guitar amp?
But, hey, there's a problem here. Cheap amps made in far east are already finding their way to the scrap yards courtesy Uli B. and other "business savvy" smarties.
So, even if ROHS was based on products lifecycle, how would the legislators ever be able to differentiate between a "insert your fav custom amp name" and EPI jr?
So to make things even more bizarre: China has implemented her own version of ROHS that is much stricter than EU directive. You think this is funny? Anything manufactured in China in compliance with their regulations is EU-ROHS compliant by default. You EU-ROHS compliant product is not good for China. The result: it's much easier to import from China than sell EU or US made stuff there.
Nostradamus could have been right. He predicted the Chinese will rule the world in 21st century.