Same could be said about NaruHina who happened at the very end, and Hinata suddenly kinda became relevant for Naruto, even though he barely interacted with her in 15 years.
One could argue that it was weird for Hinata who was basically Naruto's stalker and admirer to just fall in love for that reason, especially since he wasn't the only one of that type - Rock Lee who can't use ninjutsu at all comes to mind.
At least with Sasuke and Sakura we always knew she loves him, and they had their moments before he left Konoha, what with being in the same team, and sharing some dangerous situations.
But then again, realistically, people fall in love for various reasons, and at the various ages, even when they are over 50, so like, whatever.