Think of those moments, let's use Nidhogg Ex, when you're dodging to a pre-designated spot, but that one guy in the party is tunneling and heading your way while targeted for something. This is when Sprint can be helpful, and without the penalty of sacrificing your DPS resource. And speaking frm a MCH's point of view, I have no defensive cooldowns, and no evasive maneuver. Blank (which most bosses are immune to) and Sprint are my only tools to work with to attempt to deal with avoidable damage. I don't even have a self heal (however potent or not) to fall back on if I/someone else slips up and I take a hit for it. Sprint isn't much, but it's saved me plenty of times, with a price.