> Its also just much more efficient.

That's the sales pitch, sure.

Size scales in reverse order with security. The larger you are, the more difficult it is to make sure all the gaps are sealed - that's why the greatest of empires fall eventually - they get spread across so large a portfolio there are bound to be gaps, which are endlessly exploited, even on users of the large ERP companies.

If products were actually integrated well and deployed well all of what you say would be true. But that's just not the reality - trust me, I've been there. It's bad.