Land eventually exert pressure in the form of property taxes. For water rights there's no such thing.
In general, I feel like humans should not "own" natural resources. You can rent it from society, which is how I view property taxes, even though that's not exactly what they are.
I also don't think they should be arbitrarily seized. According to the article, some of the water reductions are being compensated for monetarily. I don't know the whole story there though.
AFAIK, you can't legally just buy a farm in the imperial valley and say you're going to use that water for residents in Arizona. Rights are based upon the use case.
Let's assume I agree that it should be a shared resource by all. How do you get from the current state to the desired state.
You start from a place where the state has granted water rights by law and told people that this is yours, you can use it up to the very last drop. This has been the law for 150 years and people have built businesses and lives based on the idea that the government upholds the laws and contracts it made.
Do you just start one day and tell people with water rights that it sucks to suck, but the people have decided that they want what we previously promised was yours forever. It's your fault because you believed that the government would be consistent and uphold it's commitments.
Do you feel that way about other property rights such as land and housing?