Having people to rely on is important. Bruce may not have needed someone to teach him how to be human but he did need someone to help guide him after his parents passed away. He realizes how far he's gone sometimes but he also realizes how much further he could have gone if Alfred hadn't been there every step of the way to sass him and keep him in line. It's weird to not have the older man by his side, honestly. There's been few constants in Bruce's life but Alfred was always one of them.
But at least he isn't alone. There's something weirdly comforting about that.
Something almost akin to a smile tugs at his lips. "Likewise, Supergirl."