Rhoa mount totally useless after sprint was added

Does anyone see the point in using the rhoa mount anymore after sprint was added? Looks like sprint adds nearly 50% extra speed, where as the rhoa mount just adds 15% (You can not sprint while mounted because dodge rolling takes you off the mount)

The point of the rhoa is to fight while mounted (80% reduction to speed penality) you can literaly fight some bosses by holding left click on them an just doging with the roa. GGG coul still add a sprimt key instea of doge roll giving you sprint while mounted.