The flexibility to scale up is very good. Regardless of the customer, customization is not as complicated as it is in SAP or even ISS and other products.
There is a range of modules available in Oracle which you can switch on as you progress in your organization. You don't have to necessarily take a lot of time to kickstart the implementation. You can just start with basic HR, finance, and purchasing. Then, later on, you can extend the application landscape with more modules as you progress. There is essentially one solution for every industry within Oracle — you won't require a third-party solution. Still, if you wish to use a third-party solution because the price is too high or because of a specific technical requirement, then you are free to do so.