I'd just like to add that I think ALL covered (finned & gloved) forearms have a cut joint like Roboto/Horde Prime to maximize swap-ability.
Skeletor, Drego-Man, King hiss/Hordak ect. So nothing like this could ever prevent collectors from having what they want. Same goes for shoulders. If all the figures had interchangeable limbs like Trap Jaw we wouldn't have ever had a problem with Roboto & King Hiss to begin with.