If you're capable of getting through the Strike and beating the Boss in 10 minutes it is most definitely not taking you 25-30 minutes to wipe out the Lvl 24 enemies that you are allowed to pass up. It's instead saving you around 5-6 minutes and costing you on average a half a Strike or more in at least Rare drops. Because your not guaranteed anything of value on the end game roll. You could easily get two decrypted blues, a shader, or only one Rare engram after passing 2-3 Rare Engrams from Mob drops on your way to complete it. Try running 10-20 Strikes by not skipping any of the Lvl 24 enemies, time yourself, and average how many Blue Engrams you end up with. More than likely you'll see it's more efficient to speed kill than it is to speed bypass.