i've always planted them this way and have never had any problems. I grew two bagseed this way that yielded me a little over a QP and i've got 2 bubblelicious, 2 smurfberry, and 1 diesel ryder right now. They were all germinated and sprouted this way. My geminated seeds usually have a fairly long tail and the root tip clearly goes down. While it's true the root tip may curl around the seed I have not experienced this. When i germinate directly in the medium i plant the seed butthole down haha. I'm of course referring to the small circular indent on the bottom of a seed. I currently have 3 bagseed and 1 haze growing in a seperate tent this way. All flowering well might i add.