A recent article by Gabor Csomak discusses how doing fewer story points will over time increase your velocity. The concepts presented are on point, but a clear discussion needs to be had regarding the use of the words Capacity and Velocity as they are not interchangeable.  https://medium.com/nerd-for-tech/why-committing-to-less-story-points-will-increase-your-velocity-d821380c6c5