Should all pound cakes be placed in a cold oven?

No - Paula Deen has an excellent recipe for Georgia Southwest Cold Oven Poundcake which knocks your socks off. I have served it multiple times to company and always a hit.

I always bake mine in a cold oven and they turn out perfect every time.

I've baked many pound cakes. None that I can recall started out in a cold oven.

No, but I have two recipes that calls for a cold oven, so it's not true that they should never be started in a cold oven. I do what I am told when it comes to old school cake recipes. They both turn out incredibly well. There are several posted on food52 that call for a cold oven.

Sorry - I hit Enter too fast. No, no pound cakes should be placed in a cold oven. If you've use room-temperature ingredients, and mixed it properly, there is no point at all to placing it in a cold oven.

No.

Mine goes in a cold oven,my moms recipe from the 50's

I've only baked pound cakes in a pre-heated oven