I did not experience a swamp when I applied for SSDI. I made an appointment at the Social Security Office and went at that time. I was interviewed, the interviewer wrote down my answers to the questions on their form, and the form was submitted. I was approved 6 months later. It was 1 form. It was a long form, but it was only 1.
I later helped a friend with his application. Again, it was one form, and I helped him with his answers. There was a place where friends could write their information, too, and I did that, describing how his disability affected his life.
Instead of relying on the Internet for what might be the case, why don’t you just call Social Security? In my considerable experience, they are very easy to talk to, and they will give you facts.
Also, I was not on unemployment at any time before approval. I was, however, on welfare, which I had to repay when I was approved. If I remember correctly, welfare was $418/month, and I was on it for about 5 or 6 months. It was not a lot of money.