What makes productionizing R difficult? I'm curious about whether the rise of Python in data science is really just because of the lack of flexibility to integ

What makes productionizing R difficult? I'm curious about whether the rise of Python in data science is really just because of the lack of flexibility to integrate with other systems. I've read that R seems to do better in data science/analytics work but when it comes to integration, it's more challenging. And any insights on which companies are already doing industrial scale modeling?