I agree with that, but the foundation you are building on is still human.
You just improve it and evolving it in every possible way.
I think you fundamentally don't understand what I'm trying to tell you.
Genetic changes are one thing, but Superhumans are still "technically" human.
They have two arms just like humans, they have two legs just like humans and they have identical internal organs.
Although they are better and more developed in everything, they are still human from the "technical" point of view.
From a practical point of view, they probably couldn't be considered humans anymore.
Wel, maybe some kind of... Superhumans.
Even huge energy pool it's not infinite, especially when it comes to fighting an opponent of the same level as you.
Logically, you then have to rest and replenish your strength. Do you know a more effective way than eating and sleeping? Plus, even Superhumans have stomachs. And I don't know if you've noticed, but when your stomach is empty, it's an uncomfortable feeling. Would a Superhuman be able to survive for very long time without food or rest? Definitely yes. Would they be able to survive indefinitely? Definitely not.
Please avoid arrogant comments where you imply that you understand things that were not explicitly stated in the game better than the game creator. We can only theorize based on the information we have, nothing is certain and until explicitly stated otherwise, all opinions have equal weight. Let's be polite and respect different opinions.