The problem with those, as anyone who has worked with those systems, is that the canned reports are quite generic. At best, for a decent-sized enterprise, they're starting points for the business report writers. Been there, done that, too many times. So, you either roll your own or customize what's there to fit the idiosyncrasies of your company's accounting and ways of doing business. NO company fits the Chart of Accounts exactly how it is set up in the default COA's of accounting systems. So there goes many of the canned reports out the door right there.
Using a major ERP system (e.g., SAP), you're not going to be reinventing the wheel, but hiring various levels of contractors and consultants to do it for you, or in the case of SAP, to customize your business and systems to fit SAP, as that is usually the path of lesser resistance, but still expensive.