Ask HN: Golang for Monolith Production Web Application?

We are revamping our product from PHP and I have selected Golang considering how much I loved learning it for the past 12 months personally. However, our Lead Architect (the guy who actually will run this) is a bit hesitant since he is not sure how mature Go is for monolith web apps (the usual CRUD/routing/server side templates etc with vuejs for frontend). He is very good at his job so he can pick up any language in a week. We are currently only into PHP as the server side language even though he has a .NET MVC background before he joined us.

How do I convince him ? I am the owner so I can tell him to suck it but he is the one who runs it. So he needs to be on board. Pros and Cons ?