[megunderstood]

Sounds like you didn't read the article.

The idea has nothing to do with creating artificial competition and it is actually designed as a form of collaboration.

Some work requires concentration and the defensive team is there to maintain the conditions for this concentration, i.e. prevent the offensive team from getting interrupted.

[Towaway69]

Ok, that might well be the case! Many apologies for my mistaken assumptions.

Then perhaps the terminology - for me - has a different meaning.

[Kinrany]

It's a common and pervasive mistake to assume the meaning of a term by association with the words used in the term. Names of terms are at best mnemonics.