The issue with competing against SAP/Oracle is the kind of traction they have in the market already. Their contracts are long, and companies spend so much implementing the software that they're not excited to switch.
Also, as mentioned somewhere else in this thread, ERP software (Payroll, HR, Financials, etc) are all about the details. Payroll and Financials are very complicated, which results in companies only trusting the big players (SAP/Oracle)
Do companies like this ever get involved in lobbying? The complexity of the problem seems to be the core of their value proposition, so I wouldn't be terribly surprised if they subtly or overtly opposed simplifying reforms.
AFAIK, the answer is no. I honestly don't think they need to. The complexities are mostly a result of globalization (different governments policies, taxes, etc) and changing business models/products (material management, pricing schemes, etc)... all of this at scale.
Also, as mentioned somewhere else in this thread, ERP software (Payroll, HR, Financials, etc) are all about the details. Payroll and Financials are very complicated, which results in companies only trusting the big players (SAP/Oracle)
Disclaimer: I work for Workday