vBulletin was born of an age when having more options and more data displayed was a desirable thing. People wanted to be able to control minute details of the way they interacted with a forum - or so we thought.
XenForo is a product that debuts with decades of experience already under its developers' belts, and perhaps a degree more maturity in outlook. Our focus with XenForo is on providing a superior user experience rather than piling on new features. We are more of the opinion now that if we believe there is a right or optimal way to do something, we will just do that, rather than providing options to allow people to do it another way.
This simplifies the code, which helps prevent bugs and speed-up development, and usually makes for a more immediate and enjoyable experience for end users, who get the best out of the software without having to go and set it up themselves. Our years of experience with the software and dealing directly with customers gives us the confidence to do this with the expectation that the choices we make will be the ones that are best for users of the software.
Of course, sometimes we get it wrong, and the way that we think is best is not what our customers think - obviously in these instances we look again at what’s been done and what’s been said and decide if a new approach needs to be adopted.
Additionally, we are not in a mad rush to put more and more features into XenForo. Our focus is far more on quality and user experience - making what we have really enjoyable and intuitive to use, allowing people to rediscover how great it can be to simply post messages to each other.