But, as we have seen even this pre-season, Roy seems to disappear into the background with Miller handling the ball at the start of games
That may be, but when you give up when something is hard at first, you're guaranteeing a failure. It's a bit silly, IMO, to say "We tried it, it didn't work immediately, so clearly it can't work." I don't know what the right length of time is to give it a chance, but a few pre-season games seem awfully early to write it off as failed.
Roy is best when he controls the ball
Roy, as far as I can tell, has never attempted playing any other way. That could well be because he's incapable of it...it could also be because he's never been asked to and tried to get good at it.
Miller is what he is, at this point. I think his career has been long enough that he's well established what he can and can't do. Roy is young enough that I think it's still possible he may have more things he can do than he's shown. This is not an insult to Roy, it's the opposite: I (and probably the Blazers) feel he may still have potential. This argument seems to have taken on a tone of "Why do you want Roy to change?" as though it's hostility to Roy. It's very much the opposite. It's the hope that he can be an even better player. May as well find out.
At the end of the day, it's an efficiency game - Should Microsoft drop Office in order to make Bing more attractive?
Can you quote me someone who's suggested that Roy should "drop" his ball-handling game?
The correct analogy is whether Microsoft should devote all their resources to polishing Office endlessly, or whether they should diversify and try to make some money in other things, like search, while keeping Office as their core.
Again, it's an efficiency game. Roy should work more with the ball in his hands and improve on this facet of his game.
There are two types of efficiency, and I'm not sure your viewpoint fits either. There's more efficiency in maximizing Roy's abilities and efficiency in maximizing the team's offense. I think seeing whether Roy can play off the ball is both in his best interests and the team's.
Again, if he works on it and finds he can't do it--fine. There will be many minutes to be played in his career and he can play the rest of them the way he already has. If it turns out, like Kobe and Jordan, that he can also play off the ball...he's a better player and the Blazers are a more dangerous offense.