A real monolithic app dealing with videostreaming that I have been working recently, was based on Spring Boot and AWS SDK and it was a 82 Mb jar file. It had the drivers, oauth stuff, a couple of template engines for business reasons (Handlebars and Thymeleaf), database and queue drivers etc. It could be maintained and extended by a junior developer, because it had established design patterns and they only needed to follow some project conventions. We had multiple releases per week at engineering cost of less than 25k€ per year. I would not be able to build something like that with that budget on Go.