"Friends" beyond the superficial level that is basically natural requires us to not be busy ass 30-somethings.
Generally speaking, for people who don't even have the time or energy to foster friendships and superficial relationships that are already in their life, it's gonna be hard to find, evaluate, and build potential romantic relationships.
That's what meetups and hobby-based activities are for. They're supposed to be fulfilling enough for the activity alone, with the added social benefit of new friends added on. If you'd be willing to do that for the possibility of meeting new romantic partners but not the possibility of meeting new friends, that's gonna be a pretty tough sell even to the potential romantic partners, that you're not really there to make friends.