Last year I got Shinobi Tex[1] - a mechanical keyboard with a trackpoint and it's so incredible good that I keep a spare for if it eventually breaks down.
My hypothesis is that if an action feels more expensive than average we subconciously try to avoid it. In other words, if I need to move my wrist to the mouse/trackpad then I'll be subconciously avoiding this action or at least deprioritizing it. Reducing these statistical outliers creates a much more productive and ergonomic environment and Trackpoint and VIM-like programs are amazing tools to address this issue.