As far as admins say you should boost workers if you need more workers what if you simply can't... Look at the poor guy above who has 19000 metal and no workers to recruit more units.
Even me I've built all the structures i need and i'm down to 200- workers. I'm seriously struggling and I seriously can't boost this era (as much as I would love too, I got problems at home and I just can't get the money for this era. :/)
Just saying, think about those who can't boost as much. So far i think there's been 1 worker boost and back on one E1 era I think I had 5 workers boosts (50 workers each boost) by now... I know it's a boosting era but eventually non boosters aren't going to be able to do anything because they don't have the workers