The Dragon Rulers were so OP in the TCG that all of them were banned in the SAME banlist. The way they dominated tournaments was so uncanny Konami had no choice but to banish them from existance.
They are like the IRL version of the Egyptian God cards in the anime. Releasing them in Duel Links wouldn´t break the meta, it would tear it apart.
They're way more than just "a bit" lol. They dominate the TCG meta to the point where they're the only deck anyone played because even newer archetypes can't compete with them, causing them to be banned.
Honestly, it doesn't take much experience to know the Dragon Rulers are too broken.
They really should have been just purely Attribute support, instead of both Attribute AND Dragon support.
Heck, Wyrm-Type was made exactly because of Dragon Rulers. They don't want some of their newer cards to be able to interact with Dragon Rulers, so they changed some of the newer Dragons into Wyrms.