Just because plasticizer has the word in its name doesn’t make it plastic. Nylon, PLA, PET, ABS, these are plastics. As far as I can tell they are not endocrine disruptors, and they are polymers - aka plastics. They require no other “ingredients” and can be used in an unadulterated form for many applications.
Phthalates are monomers (aka not plastics) that are added to plastics to change physical properties of a plastic, such as flexibility, durability, make them more transparent, etc. They’re in fact derived from alcohols to my memory, and have no relationship to plastic. But they are also called plasticizers because they make plastics behave more “plastic” (in the adjective sense not the chemical sense). They are also suspected of being endocrine disruptors. But they’re not “plastic ingredients” - their use is optional and there exist alternatives.
It is in fact an important distinction. There are other plasticizers that are not biologically active that can be used in place. Or, plasticizers don’t need to be used at all. Both of these options make the plastics benign.
It’s an important distinction because plastic isn’t the problem at all, it’s the regulatory framework around plastic additives, none of which are strictly necessary and there are almost always safer alternatives. Plus it’s important to distinguish because it’s simply false to say plastics are a an endocrine disruptor when they aren’t, even if it’s convenient to get your point across.