Many are afraid of being the 'crash test dummies' of the iPhone X & hence giving it a miss in the hope it'll be more refined in its next iteration. The two biggest concerns seem to be the Notch & Face ID. With the notch, App developers could eliminate it by blackening the ears, hence reducing its intrusion-factor for much of the user experience. Sure it'll be there for the home screen & core Apple Apps, but 3rd parties may think outside the box & kill the ears. With Face ID, authentication speed/process could be tweaked by the unlocking time being reduced &/or not requiring a swipe up post-unlocking. What other issues are you concerned with that absolutely can't be fixed via software tweaks?