Yes, extensive past life work can answer a lot of questions, not only for oneself but for others as well.
In my case, being abducted by certain ET groups for the past twelve millennia and working with another abductee, "Jack Wylie", we discovered the modus operandi of an ET group, often called the "Anunnaki", that created the Earth-based insidious mind control operation by creating religions and secret societies. I covered this phenomenon extensively in THE EYE OF RA which documents my independent research and exposes the Earth matrix and four different, but colluding, ET groups.
Another benefit is that I found out who I am. I asked that question of myself many times when I was a child. And I finally got that answer many years later in past life regressions.
In another regression a fencing scar actually appeared physically on my face. This taught me that we live in a holographic universe.
Also, it is of benefit to abductees in general as it answers their questions (which they get directly and not from channeled entities, lol) and helps to alleviate the trauma thereto. There have been many other benefits but I don't want to belabor the point.