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It's a good point, but desalination has the same issue. Whenever you use seawater to produce something with almost no salt in it (be it desalinated water or crops), that means the salt has to go somewhere else. Probably in concentrated form.
Desalination may not salt the earth, but brine can create dead zones in the water. There are solutions like diluting it, and there are cases of operators who don't care. Either way, salt is an issue if you use salt water. Has to go somewhere.
Diluting it is just undoing the desalination on the water used to dilute it.
There are better ways to do this. Examples:
In theory, this could give and take the same amount of salt water to and from the ocean, while still providing desalinated water for use.
Another way to dilute brine is to add it to the ocean in small bits in multiple locations, so neither location exceeds a certain salt concentration.