The problem with any of the old 'killer applications' like spreadsheets is that the network effect now dominates the productivity market.[1] So you'd spend mos

The problem with any of the old 'killer applications' like spreadsheets is that the network effect now dominates the productivity market.[1] So you'd spend most of your energy on trying to maintain compatibility and feature parity with an application that users are very resistant to moving away from. It's a pretty bad risk/reward unless you have a use case with a 10x (or more) value proposition. [1] Back when businesses were mainly concerned with internal document sharing it wasn't as much of an issue. But as that expanded to marking up documents with outside lawyers, accountants etc that changed quickly. When the Internet happened for the masses in the late 90's it was game over for most of the competition.