Thanks for your reply kaneohe.
I just called IRS hotline, waited an hour for their Schedule D expert. When I explained my question, she said they’re not allowed to discuss Wash sales. When I asked about all types of adjustments for 1099-B where Basis is reported, whether those with adjustments can be isolated on 8949 from the rest of the summary, thus avoiding having to mail it in. She insisted that all types of transactions, even if there are no adjustments, must be mailed. Perhaps she misunderstood me, I asked her about stock and option transactions, but she kept referring to “Disposition of capital assets”. It was my understanding that IRS changed this law a few years ago, where you no longer have to mail in a statement for which Basis is reported and there are no adjustment, but she insisted that’s not the case.