Seems like overkill, but you are in a safe zone. Especially if you need to add another part that requires power from motherboard sockets such as a fan or whatever.
What kind of bad experience that you got with those two Molex connectors? Melted? Or may can't boot to the system? That motherboard requires that additional power from two Molex connectors if we plug more than three cards on it. I have done that before, plugging six cards without that two extra Molex power, seems no problems, I think it because those all card is RX series. But, I want to keep on rules, PCIe 1X would delivering max 25 W in a normal condition. That's why that motherboard was adding two extra Molex power.
And the other thing, I agree with you.