While an ERP system can cost quite a lot, there are definitely benefits from using them. First of all, there are legal requirements for a big company to have accounting records, produce accounts and have them audited.
While it’s not a legal requirement to use an ERP system for that, it’s better to have all the important functions managed by one system. Imagine being able to maintain one software that include accounting, finance, HR, inventory, Sales etc modules and functionalities. Now imagine, having one software for each one of the above. How are you going to integrate your HR system with your finance and your accounting system and how much will you spend to maintain each one of them.
So, the short answer it definitely yes. An ERP system can make a company much more efficient. There is however a cost for that!