Curiosity
The shidduch system is supposed to vet prospective marriage partners so you dont waste endless hours dating people who are not for you. I can go chat up every girl I meet at a chasuna and still end up single and so much more frustrated and confused and having spoken to so many more girls than necessary. The shidduch system is supposed to match you up with someone compatible and looking for the same thing. Its much harder to find that when you just start talking to random girls/guys.