One might argue that some SaaS product teams hold back adding new features almost to a fault. Basecamp and Sifter come to mind.

Edit: I know more about Sifter than Basecamp. I login to Basecamp every few years and it seems like not too much has changed to my untrained eye, but maybe they did stuff under the hood. For sure I know that Sifter got to what they considered peak features and stopped.