But the point about simple & flexible tools is not to miss on features for the user, but to separate those into different tools. The people who prefer a simple text editor to an IDE aren't doing everything else by hand, but using a set of different tools to accomplish the same as the IDE built-in features would.

Taking the Beeminder example, and with the caveat that I've never used it: the graphing system seems cool, but it can't be used by anyone who doesn't have access to a credit card; if the graphs and the commitment payment systems were two separate tools that you could connect instead of a bundle, one could use the former with an alternative commitment system.