I am a medical guy, for about 35 years. Still leading frontline teams. Some answers:
1. You are correct, in most diseases having the disease beats the vaccine. However, covid appears to be different. The persistence of natural immunity has significant variation in duration and antibody levels between individuals, not related to severity of disease. The mRNA vaccines seem to enhance the antibody levels, especially more than 3 months after recovering from infection. The duration and durability of immunity from the vaccine isn't nailed down yet, but looks like it will last longer than infection derived immunity.
2. Based on antibody studies on covid patients and vaccine trial participants over the last 9 months
3. Negative on the squalene or thimerosol or other nasty stuff put in some of the mil spec vaccines some of us got back in the day. The Pfizer vaccine is really clean by comparison. All except those nanolocation tags and mind control agent. Just kidding.
There is no reason not to get the vaccine if you had covid previously. It's rare, but some incredibly lucky people have gotten covid twice. Some health systems are "de-prioritizing" healthcare workers who have had covid in the last three months because vaccine is in short supply. As for waiting to see how things play out, we already know what the first 3 months after the Pfizer vaccine looks like in tens of thousands of people in the phase 3 clinical trial- and it was pretty damn good. I took the vaccine yesterday.
My only worry is that I'll starve to death as a zombie because so many people's brains have been turned to unthinking mush by social media.