Ok, so I get that there is a consensus about not using Gedcom updates, but still my exact question is not answered, so here is an example of what I am asking.
let’s say for example that I uploaded John smith to the tree, in 2017, the sources I had at that time say he was born in 1904, he was married to Jane and had 6 children.
Then three years later, after more research I upload a new GEDCOM and now John was actually born in 1905 he has 7 children and I have sources for all of it.
Does the new gedcom merge the two and have all the info? just the updated info? Does it remove incorrect sources?
I get that going in and updating John and his family individually would be ideal, but my tree has 200 updates just like John, so I’d just want to know what happens when Gedcom introduces new info to a person.