What's the perceived benefit of not allowing the spouse to work? Is this a "they took our jobs" situation, or is there something substantive behind that policy?
1. These visas are for specializations. This implies that the job is unique and pays well above average salaries so a spouse shouldn't need to work.
2. They want to be attractive yet not too attractive. I'm sure in the subcommittee negotiations on quota it came down to spouses or quotas, (we can let 35,000 families or 70,000 workers). If you watch the government channel they negotiate endlessly over petty things like this.