Is there a reason ASL is kept separate from spoken language data?

Primary language or language spoken at home are comment demographic questions, however ASL is rarely included. My gut assumption is this is ignorance and ableism, however are there any reasons to keep it separate when reporting out on aggregated data such as “English-speakers” and “Non English-speakers”?

I am interested as well. Census bureau has a small section in their FAQs, here
Although, it’s a pretty lame excuse to say: “the data is not collected because we didn’t set it up that way”

I do know that ASL and English are different. Someone may be fluent in ASL but not in English.

Seems like at the root of it is that the term itself “speakers” leaves out many in the deaf community.

Here in WA State (K12), ASL is included as a valid language code for the questions about student primary language, language used at home and family’s preferred language. We use “language used” wherever we can instead of “spoken” so it’s inclusive. The only reason I know of to separate it out is if the work is specific to the body of law that protects each group from discrimination, ADA vs. Civil Rights. Our language access program is inclusive of both so we collect the data together.