Because they all used to be that (see old OkCupid, match.com, Plenty of Fish, etc), but swiping apps stole the majority of their user base when they came around and every app had to become another swiping app to attract users. 9 times out of 10, the person being approached is gonna look at the approaching person's pictures and "basic stats" (age, height, kids, religion, job, education, pets, smoking) and decide yes/no. So what's the point of all the other stuff?