Here's a weird thought: more people should play bad decks. Instead of minmaxing the most perfect deck possible
There is 'I would like it if' and there is 'should'. Nobody bar the designers of the game are qualified to tell players what they should or shouldnt do, and even then things like Commander were born because people kept making up their own ways to play the game. One of those ways, the competitive one, is precisely getting the most out of every card in the deck. The most fun? no, the most winning. And it will happen whenever there are rewards attached. If you got rewarded for 'fun' then people would clown themselves to death. But since Arena isnt designed that way, you get what you've seen.