How can you disagree? If you are able to farm enough loot without the collectors to keep builders busy, you don't need the collectors.
The collectors in total represent about 295 days of builder time. That is nearly two full months with all 5 builders working on them. A person that is able to channel the builder time into their other buildings will be considerably further along than someone who works on their collectors instead.
This is common sense really.
Now you may like the extra loot collectors bring and that's great. Upgrade them. However if you don't need it, builder time is better spent elsewhere.




