Phosphates do cause huge problems though in some areas, I really don't see any major advantage to using them given the results I get with Persil (UK/IRL), Ariel (UK/IRL) etc, none of which contain any phosphates.
If you've seen eutrophication problems in waterways, lakes, rivers etc, you'd change your mind about using phosphates!
Even with modern sewage treatment facilities, it's quite difficult to remove phosphates from waste water and most treatment plants do not remove them from the water.
In rural areas, where homes rely on septic tanks and other local treatment systems it's simply not possible to remove phosphates at all.
They leech into waterways and work as a fertiliser, causing a massive overgrowth of algae and other plants. These choke up rivers, turn them green and remove the oxygen from the water.
Then fish start dropping dead and floating to the top of the water and you end up with a whole eco system destroyed.
Laundry detergents containing phosphates only really became a huge problem in the late 50s and rapidly became really problematic through the 1960s and 70s as more and more people switched from using simple soap-based detergents to more chemically complex versions and as the automatic washing machine became basically 100% universally available to any household in North America or Western Europe at relatively little cost.
Switching over to zeolites and other non-phosphate water softeners has had a huge impact on improving the environment.
The major issue now is that dishwashers are going through the same kind of growth cycle that washing machines did 30-40 years ago. It's increasingly rare to see a household that does not own one. I reckon you're going to see MAJOR pressure put on to reformulate dishwashing detergents to remove phosphates from the formula in the next few years as dishwashers are becoming a major source of phosphate pollution, even though they use nothing like the quantities of phosphates that old laundry detergents in old washing machines used!