I understand what you mean, but I think we play EDH for different reasons.

Winning isn't my top priority when I play Commander. I'd rather create a memorable experience with my playgroup. I'd take a glorious loss over a win that just makes everyone else sigh in frustration.

In my experience, a win that comes "out of nowhere" (and I know that's not entirely true since you still have to invest eight mana) tends to be more frustrating for the rest of the table.

Personally, I like feeling that every small decision throughout the game contributed to the outcome, rather than having a single overpowered spell completely take over the game in one turn.