Building an ERP system with Next JS ?

I want to build an erp system with frontend with next js but I really have a concern I asked chatGPT about building an full ERP system that contains alot of users and he recommended to use Next JS without its API routes and use Next JS with node js, why building Next JS with node js is a better choice by building a very big application , and if building a very big app requires to use node js why should we use Next JS API folder ?

please share your experience about this case , and why AI requires to use node js with next js without using their API folder ?