Eren learned to appreciate his father's unseen care only in the second line after achieving a semblance of success in Anfang.
It was Elijah's teachings that had profoundly shaped Eren into the man he was today, and he was grateful to his father for that care.
Why did Eren fail to implement Elijah's rules the first time around when Alephee wasn't there to assist him?
It was only because Eren had chosen to consciously ignore his father's teachings that his life had turned so miserable in the first timeline.
Following those teachings had been a difficult process, but he had never imagined that abandoning them would lead him to be controlled by his circumstances and vices.
As such, Eren understood all too well the importance of concepts like "condition-based care" and "minimal assistance for maximum impact."
