I don't see anyone pulling off a Torch operation unless the US and UK move a lot of there fleets into the sea zones the transports will pass through one of the other reasons I'd like to attach a fleet to an invasion force besides not wanting my troop ships to be sunk when I'm transferring them from say Britain to the India. I understand why it's required for now but if I attach a large enough Escort fleet to a troop transport convoy this should theoretically provide me with temporary superiority as it passes through each zone.
Additionally, the current system does not account for supply along the way to the enemy shores. If you were to bring hundreds of escorts, then they would either have to spread out in order to allow resupply along the way, or go in a grouped formation in order to defend the transports. It's not as if they're growing cattle and producing artillery ammunition aboard those ships, and thus, no prolonged naval warfare would be in your favor.
Honestly, I'm with you. When Germany invaded Norway, they sure didn't have dominance over the north sea. Unless anybody wants to say the Kriegsmarine had the RN cowering in their ports.
I think the main reason the war against Norway went so well was because of the United Kingdom being unprepared, and thus not having its navy located in the area to intercept German transports. While the belts are more narrow than the Thames, Skagerrak and the Channel are pretty similar in size. Yet I don't see you being able to cross over to Dover from Calais.
This is tied to a more serious problem with Hearts of Iron, and that is that the diplomatic DOW against Denmark happened after troops had already crossed the border. The German ambassador told the Danish foreign minister that the German troops had moved in on Jutland in order to (paraphrasing) "protect against a British intervention". The DOW mechanic in Hearts of Iron kind of removes the element of surprise, and thus one of the strengths of being an aggressor.