You are on a mission. You want to get a nice silk saree. You are guided to a particular section of the store based on your preferences. You randomly tell your colour and design preferences and then you are shown numerous sarees that match your description. Beyond this people proceed in a different way. Some narrow down options by elimination, while some others do it by careful selection. A lot of thinking goes behind the scenes.
Consider another scenario. Your mom asks you to get a packet of Gulab Jamun mix. She specifies that she wants only the MTR packet. So you go to the store and head to the appropriate section and look out specifically for what you have in mind. And then you get to the section where there are hundreds of other packets, with the same name. You just pick one at random not worrying about which of the 100 packets you need to pick because they're all the same.
So, some things happen for a reason and for some other things - they just happen.