People make this argument about all sorts of silly things. Like "Bleach is a shounen manga! There's not going to be a pairing in it! It's for the fights you guys!"
...because KT hasn't given nearly every main character and side character at least some kind of romantic interest, and hasn't gone extensively into Orihime's feelings. Hell, most of the shounen manga I know have actually ended up marrying people off. (Yu Yu Hakusho ended with Yusuke and Keiko getting married, Dragonball pairs up literally everyone and gives you their kids, etc.)