Just an example, but Salesforce.com, SAP and Oracle all have apps for their services.
I think the "issue" is not that the iPad is not suitable for what it was intended. It was positioned by Apple as an in-between product between a laptop and a smartphone, and it is exactly and precisely that. This is also supported by the app portfolio available for the iPad.
I think the real "issue" is that the demand and market have slightly shifted. The iPad has paved the way for tablets and proven that it is a useful device. The market now wants additional functionality that goes beyond the current one. Nothing wrong with that, but that doesn't mean the iPad needs to change. It could be time for an additional product to cater for that demand => iPad Pro.
In addition many people still expect a tablet to cater to the same use-cases as a laptop. I don't agree with that view. All attemps at merging the two concepts have come up short. Two examples that I have personal experience with:
- The Surface Pro. Well built device but elememts of the desktop OS are difficult to control with touch. The keyboard is not suitable and responsive enough for long writing sessions.
- Lenovo touchscreen / convertible laptops. My company is implementing them as the standard consultant laptop. They have the same issues with touch control of the desktop OS. E.g. Internet Explorer has issues itself with touch control, freezing in certain javascript operations. The device is also too heavy to support long term handheld computing.