Darius - Poor Performance right now?

Hey, im playing Darius for a longer time, and wasnt happy about the rework at first....but after some games it is rather fine. Just...different. Is his q meant to block any usage of other spells or abilities while the wind-up time? I mean, in the past Darius had some good lvl-6 Kill pressure. Even when the enemy got away you could usually follow up with an Flash>Q>R>Ignite Combo. This is now entirely impossible. I can either choose between using my Q and waiting .75 seconds to do anything else (the enemy could flash away easily) or i flash first and activate the Q followed by the .75 second delay before i can use R and ignite.

The whole surprise-killing potential is destroyed. So...was this really wanted? Should it not at least be possible to use any summoner spell while waiting for the Q windup?