It doesn't feel weaker in the sense of how much dmg you can do but it doesn't feel weaker in terms of resource control, as in it went from not great to non-existent.
Since the power source for the throne on Zakuul was buried in the planet inside a rather sizable facility, the one on Odessan is probably a remote control point like Arcann's flagship.
They could end the story here or add bits and pieces over time like they did with Oricon and Ziost or maybe an epilogue chapter to tie off any remaining loose ends (like LIs). But unless they have another major story arc in the works I don't see anymore multi-chapter story expansions in the future.
You can always dismiss this as Jedi arrogantly assuming that since you're a sith you're a bloodthirsty psycho.
Anyway, the KOTET chapters for me were better than the KOTFE chapters (especially X and XI) but there were alot of missed opportunities.