Hi!

First step in asking "why incremental forever"
should  be an answer - and try to answer it yourself - why 
"you do fulls every week".
I cannot remember having found this approach 
in The Ten Commandements, 
so alternatives should be allowed (grin).

Once you have this answer, then ask 
about incrementals forever again, 
about that how they work, what advantages and 
disadvantages they have.
Only then you will be able to compare this 2 approaches.

There, in your comparision, you will easilly find your answer.

best regards
Juraj Salak