There's poetic irony in how Delling Rembran, a veteran who uses his (understandable) fear of how Gundam mobile suit development would inevitably lead to his fellow soldiers being treated as replaceable parts of a machine (moreso than they already are at least) to justify committing atrocities, is confronted with the fact that as CEO, for all the wealth and power the position offers him, he is ultimately just as much of replaceable cog in the machine of the Benerit Group as he ever was as a soldier.
I know some folks are dissatisfied with him getting sidelined halfway through the show, but I would argue that it was necessary to highlight the fact that G-Witch's 'main villain', following in the footsteps of both several other Mobile Suit Gundam series and Kunihiko Ikuhara's post-Sailor Moon work, is the systemic evil of the Benerit Group as a whole, rather than any individual human actor. After all, what better indicator of a machine that runs on dehumanizing ideology than one that continues to operate its evil after its own creator is deemed obsolete?
In the end, I do wonder, did Delling scorn his daughter for destroying his life's work and proving just how vain and hollow all his rationalizations for his sins were, or was he actually proud of her for doing what he could not, for finding an alternative to the bloodstained prison of 'necessary' evil he would have condemned her to had he succeeded in his goals?