Originally Posted by
Brian Ratliff
It seems the OP has answered his own question. If you value the ability to finely control your bike, then rollers are invaluable as a training aid. Fine control is fundamental to everything on your list. Also, you left off your list pack riding, which seems relevant if you are looking to get into road racing. If you don't value the ability to finely control your bike, then rollers are a waste of time and money. Also, if you choose this path, be prepared to piss people off in a road race.
Mostly agree but you still badly misinterpreted the OPs post.
You can be the finest roller rider in the road and still suck at riding with others. Conversely, you don't need to ride rollers to be comfortable riding in a tight group at speed. Relative to racing or riding in a fast group the time required to become proficient on rollers is minimal.