If Tolkien had lived to be 100, the Silmarillion would be vastly different. I believe the published Silmarillion is, despite some wrong choices, about as close to what the Professor himself would have published, had he been forced to do so. You have to make decisions, but Tolkien was too much of a perfectionist and too Niggle to give up his authorial power to change things.
I fully agree with
Mith - I also prefer the vast amount of maybe to a few certainties. Besides it gives us more to discuss.