The bowl of water is a water bucket that just requires some wood, rather than iron, which makes vanilla buckets useless, unless you’re going to use them for liquids other than water.

I expected it to break after placing the water, but it didn’t. Isn’t it a bit unbalanced?

This isn't a valid issue.

They can't be used in crafting recepies, and yeah, you need other liquids too

You’re right, but still… I think that they should break after each use. With just one wood block, you get four bowls and still have one plank block left over.