Even if not everyone agrees with them they all have their benefits

The sniffer brought new plants

The allay gave us a way to sort non stackable items

And the glow squid made signs easier to read

And let's not forget the phantom, it gave us slow falling potions and a reason to sleep

Phantoms also made it cooler to repair elytra

What's wrong with allay

I don't see anything wrong with it but I'm sure there are people who would've rather had something else