Its kind of a niche scenario. Let's say for example you're running brawlers and you have 2 2 star Tahm Kenches and then a chosen frog shows up. I could just take the chosen kench but I know I can get a better chosen later. I can use the bug and get three star kench really easily and still be able to get a better chosen later. I get to save gold and time while having a strong early game.
Even in that scenario, your bench had to be full enough to act on it.