What do you mean the variability?

> researchers looking at SARS-CoV-2 antibodies in people who had recovered found that the difference between the highest and lowest levels varied by a factor of over 1,000.

Citations in: https://arstechnica.com/science/2020/06/antibody-testing-sug...

The average immune response to infection is good. But for some it's great and for others it is poor.

Answer is in the post you reply to. Might want to reread.

No, according to Cleveland Clinic's study, vaccine adds no benefit to those with natural immunity.

https://www.news-medical.net/amp/news/20210608/No-point-vacc...

That study is seriously out of date, as it addresses the optimal strategy to prioritize vaccinations when the vaccines are scarce. That's still, sadly, a major concern in many parts of the world, but not so much in the US and Europe.

Since then, there's solid science[1] that hybrid immunity is significantly better than either vaccine-induced or disease-induced. So taking the vaccine is clearly the better choice whether you've been infected or not.

[1]: https://www.science.org/doi/10.1126/science.abj2258