Allays shouldn't wander off. They should roam but not vanish.

Allays are currently a bit impractical to use as you have to make sure they're leashed on your farms outside. The number of random Allays I come across in my world far away from my base is crazy.

It would be way more convenient if they roamed around just like Happy Ghasts.

I realize that you can always keep one trapped as a backup but it's very annoying to have dozens of Allays just flying around hundreds of blocks away - potentially adding unnecessary load to a server.