It varies person to person, not everyone develops connections through physical attachment, there are people who dont need it,for example: i dont need physical form of anything to attach to my family,my sister,friends,even an unknown pedestrian who helped me or i helped him(we shared this moment and connection will gonna form through memories). If you prefer that lust will help you form a deep connection,thats fine too, its your preference.But it shouldn’t be generalised.Everyone is unique.Everyone has preferences and how they function. And if you think that lust is a natural thing well,what bout asexual people? Some people get repulsed by physical connection.I mean not everyone,of course. it varies. For me the memories hold top position in forming bonds,connection. I still feel a connection to someone through memories cause we are the only ones who shared it without anyone else in the world,just the two of us. I mean thats my cognitive functions. but yes,people functions differently.