Why do pre In the Zone VEX games have 3 tournament champions for worlds?

Depends on what do you mean by comprehensive?

If it is just the past seasons’ games, then it should be easily google-able (or nowadays - GenAI-able).

But if you are looking for past discussions and issues that we used to face, etc, then I would say vexforum is actually a pretty good resource.

Here’s 2 examples:

Lots of (heated) discussions on why it has been shifted from Bo3 (and also 3-team alliance) to Bo1 (and 2-team alliance), etc.
Re-Visiting BO1 and BO3 - VEX V5 General Discussion - VEX Forum

And if you want to know more about some of the past legends, etc - Who is the best organization in your opinion? - Chit-Chat / Rumor Mill - VEX Forum