Since when was being polytheistic an 'unpopular opinion'?
Why wouldn't people see the wisdom in having multiple gods and goddesses to pray to?
Honestly, only praying to one god to handle everything just seems... frustrating and a little pointless. First of all, how do you know that one person is going to be able to handle everything you're asking of them? Gods and Goddesses lead busy lives, so allowing them to divide and conquer seems more economical and logical. Relying on just one god, even if it is someone like say, Kronos, just seems like you're queuing up for potential disappointment. I mean, have you ever even thought about how much effort it might take to grant even one miracle, let alone thousands?
Anyway, give me polytheism any day. And don't try shaming me because I give thanks to Asclepius for my continued good health, or to Zeus for blessing me with such a nice day. Hera gets my thanks daily for helping to ensure that my boyfriend is loyal even though I can be a handful, and Hestia gets a big thank you whenever my attempts at cooking and being domestic don't blow up in my face. Aphrodite deserves a special place in my heart for teaching me that being passionate can be a virtue, and who could forget Eros for helping so many to experience the joys of love and sex? I even give thanks to Deimos and Phobos for helping me to understand that terror and fear can be both good and bad.
Simply put - there's a Greek God or Goddess for everything, so why should I or anyone else limit my praying to just one?