Collection inclusion: optimize inclusion requirements

Hi @SteeringCommittee and Community!

I think it’s worth revising our inclusion requirements every couple of years and there has been no global revision since they were introduced.
Let’s do it.
I opened a pull request (the link).
The PR contains some changes but it’s still WIP.
Please take a look maybe we can change much more or make better what i suggest changing.

The goals are:

  • Make the doc as simple and easy-to-read as possible keeping only things that really matter by
    • kicking out irrelevant statements
    • reformulating the rest to make it more compact

Would really appreciate any input:)