Personally, I've never thought it is the manufacturers' responsibility to teach me how to use the unit... Guitars don't come with DVD's, drumkits don't come with an instructional DVD. It is the responsibility of the USER to educate themselves. To be honest, for all the bickering and deflection of goals this forum gets, I think that users educating each other is the primary need for places like this...
This is where we should be helping each other, sharing our tips and tricks, our discoveries about the OS's. Not the manufacturers. I've discovered more that the G70 can do than is in ANY manual or Roland website. Once an arranger is released, that's usually IT for the manufacturer... they are on to the next thing, and best of luck, mate! But it is the users themselves that REALLY learn how to work it, find hidden abilities, learn workarounds for the 'gotchas'...
Sadly, there's FAR more bickering about 'my arranger, right or wrong' than there is tips and tricks, workarounds and hidden feature discussion here... All the time wishing for the manufacturer to do OUR jobs for us! But, who knows? Maybe 2009 will be the year we all grow up and start to HELP each other rather than belittle each other for not choosing the same arranger as us...