If you think you can, then go for it.
I feel like if the only reason you're hiring in the US is because you think there's a 3x productivity boost meeting in person... I mean, to me it's pretty obvious that in-person development does not bring that substantial of a gain. So maybe there are other questions you should be asking if you're in that position.
Abandoning the position of an employee entirely, just speaking as a bystander, I feel like an employer asking that question off the cuff has probably not thought very deeply about their company makeup and hiring processes if they think that sharing an office is the only reason not to outsource development. And I don't mean that to be dismissive, if you're right and you could be outsourcing development, but you're paying 3x more to develop something in-house... maybe you should think more about how your company is structured. Why are you developing your software in-house in the first place?
I've heard manager-types make this argument before, and it's just very alien to me that someone would think the single biggest difference between hiring locally and hiring outside of the US is whether or not the worker sits at a specific desk. Having worked in both a local and an multi-national office, I consider them to be two very different styles of organization, each with their own pros and cons. If you think adapting to an international development team just boils down to using Slack more, I suspect you're in for a shock.