[Thank you for an article.

It is indeed interesting but, in practice a bit simplistic.

Matching zip codes, phones are fine as long as it is entered accurately or it is a part of current address of the person. (Assuming that person is being matched).

If for example I moved to another locations (address, zip code) then grouping would be negative effort.

Sometimes, it is hard to match person by address. You don’t know it is address change or totally different person.