All companies in this space start out fast and user friendly, but to gain additional customers in this space they need to add more features. See my first item. Then they either fail or end up an uber-platform. Again, this has nothing to do with your company, it is just the nature of the market, and it's funny when someone gets an idea to start a "lean", "fast" product as if no one else had thought of that before.

Really if you think you can do better than X, whether X is oracle forms or SAP or whatnot, it's important to understand where X went wrong. Hint: it's very rarely because they were "old-fashioned" or didn't realize that customers liked fast software that was easy to use. The founders of X were just as smart/capable as you are, but they faced a market challenge and made some choices with trade offs. If you limit your analysis to "they didn't know software should be fast", then you are not going to end up any better than they are once you reach their scale. I am not trying to say that every incumbent always made the right choices. But an understanding of where they went wrong needs to go beyond "they went wrong because they are old fashioned" or "they went wrong because they didn't realize software shouldn't be filled with bugs". There are real hard problems here that need to be understood before you are in a position to improve on what the incumbents are doing.