Evolution is not about becoming better, and adaptation is always in context. There is no such thing as “better adapted” without specifying adapted to what. Species do not evolve to become more ideal versions of themselves, they evolve to fill a particular, sometimes a very narrow, niche.
The Triglavians seem highly specialized. They dwell in complex constructs. They need to change the very stars to make a dwelling compatible, and while it might seem that the mutaplasmid tech they use to adapt themselves to various circumstances makes them versatile, it actually also means they need to alter themselves to achieve that versatility, instead of just changing technology outside of their bodies.
Like capsuleers, Triglavians fill a niche. We are perfectly suitable for those niches, for controlling pods with our brains, for living in Abyssal hell. We are marvels of technology and, yes, adaptation. But we are not the “future of humanity”.
Baseline humans of other empires might seem (be) “primitive” in contrast, but they are also very widely spread, to all kinds of star systems, to all kinds of environments. They are extremely versatile - and without mutaplasmids or fancy implants, too.
When conditions change, the less specialized species, the one less dependent on adaptation to its particular niche, is the one likelier to survive.
You are both wrong, here, the Queen of Pochven and the Admiral of God.
There is no One True Path. Humanity’s strength lies in its capability to diversify.