Why do we need polar bears, parrots, fish as mobs, silverfish, endermites, and bats?
Polar bears were added as a promise to Jeb's wife after they had a son and because polar bears fit the ice part of the 1.10 update. Parrots were added to fit the colorful theme of 1.12, and they have a use through imitating nearby mobs as a kind of warning device. (Bad wording.) Notch wanted to add fish mobs as far back as June of 2010, but the team wasn't skilled enough to add them until recently. Silverfish were added to make strongholds more difficult, as evidenced by their ability to burrow into stone bricks and break out in swarms when their brethren are attacked. Endermites were most likely added for mapmaking purposes. I say this based on their small size, their non-conventional spawning method, their ability to control endermen with their mere existence, and 1.8's theme of adding more features for players (making the game more "bountiful", hence "the Bountiful Update".) Bats were added to make caves scarier (1.4 was the Pretty Scary Update, after all) and to make underground feel more alive. They're ambient mobs.
I agree that jellyfish would be a cool mob to add, but I feel like oceans have had enough love for now. Oceans received a full overhaul just over a year ago, and now they're filled with much more than just squids, gravel and ocean monuments. Give the players a break from tons of new mobs being added, and then I'll be able to support a small addition at a later time.
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Watch out for the crabocalypse. Some say the day will never come. But it will.
Feel free to drop by for a chat whenever.
If you'd like to talk with me about other games, here are a few I play.
Team Fortress 2
Borderlands series (Borderlands 2 is my favorite game, ever. TPS combat is a lot of fun and makes up for the lower-quality story, in my opinion)
Elder Scrolls series
Warframe (IGN is something like That_One_Flesh_Atronach)
Pokémon series (HGSS forever)
Left 4 Dead 2 (Boomer files always corrupt though)
SUPERHOT (SUPERHOT is the most innovative shooter I've played in years!)
Dead Rising series (Dead Rising 2 is one of my favorite games, and the 3rd was a lot of fun. 1st has poor survivor AI and the 4th is bad)
Just Cause series
Come to think of it, I mainly play fighting-based games.
If games only contained the absolute bare minimum needed to function and allow the player to complete whatever tasks are needed to beat the game they would be way less fun. Especially a game like Minecraft where "create your own fun" is a big portion of gameplay and appeal.
That said, it would be cool if these had some additional functionality. Maybe they could repel Drowned or something like that.