God, I hate this argument.
It's one thing when people argue the "phantom" secondary assist. I don't buy it but at least there's an arguable position - that some players are being gifted extra points to increase their totals. It's nonsensical, but whatever.
As for the secondary assists are worthless argument, if they were truly no big deal than everyone would have bunches of them. Everyone DOES NOT have bunches of them. In fact, the guys that usually have bunches of them also usually have bunches of primary assists. That's because their team scores more when they're on the ice, because they're elite players, because they make things happen on the ice that results in goals for their team. Sometimes they score the goal, sometimes they get the primary assist, sometimes the secondary, sometimes they might not get a point at all, but their team scores more because they're out there doing their thing.