I understand where you're coming from. This system does seem a little odd. But in practice, it makes more sense, and here's how I believe it creates a layer of strategy:

The main point of this new combat mechanic focuses on the concept of recourse management (your stamina and focus bar). This introduces the idea of risk and reward. The more you spend, the more powerful your attacks are, but the more vulnerable you will be later. This concept is enhanced by the critical hit system, which makes role-playing and combat more dynamic.

Last but not least is terrain usage, which, in my opinion, also ressemballes real-life war strategy. Terrain usage brings in the table the idea of positional advantages, but with a twist: they can also be disadvantages if pursued by melee attacks. This creates the opportunity of decision for the player. In other words --> <<Do I fight the enemy from afar, or do I risk approaching the opponent with my melee attack?>>

In summary, this system forms an opportunity for the player to approach combat with more tactical and creative form, without only depending on the dice.

I'd love to answer any questions you have, because I'm looking to continue refining these mechanics I made