This is totally not true. It depends on how you structure your project. Vue is good for simple things but it scales way better for large complex apps than React. Why? Less boilerplate. And less boilerplate = less code to maintain. Vue HTML template functions are really well designed with just enough functionality to make your life easier but also encouraging you to build custom components when you need something custom :)

My only suggestion for people starting with Vue is to not be afraid of directives (Vue directives are nice and have nothing to do with Angular directives), group your .vue components into directories and don't jump into Vuex right away (same goes for React beginners, don't force yourself to learn Redux for your 1 page app).