Mark Zuckerberg, the CEO of Meta, expressed the viewpoint that nations should avoid placing restrictions on open-weight AI models. In the English-speaking business and tech communities, "said" can sometimes be a bit plain. "Expressed the viewpoint" is a more formal and nuanced way to convey that someone has put forward an idea or opinion, which is more in line with the context of a tech leader like Zuckerberg sharing his stance on an important issue. Also, "countries" is changed to "nations". In formal discussions about international affairs and policies, "nations" is often preferred as it carries a more solemn and comprehensive connotation, emphasizing the sovereignty and collective identity of a group of people.
