Errr what are you talking about? The sticks on the DS4 are analogue... People do make up some weird stuff to suit their argument these days.

(The analogue throttle of HOTAS will be useful but none of this is game breaking, and the buttons on the DS4 for PS4 are no longer analogue input).
I have no argument the HOTAS will be more immersive, it will feel like you are flying like flight sims of old, ive tried the DS4 and while I am a n00b the control on Elite is fine on the PC with a DS4 so I expect the PS4 will be fine. Having a HOTAS wont magically make you the best pilot in the galaxy, practice with any controller will be required.
Touchpad will give you mouse scroll in the galaxy map and 4 extra buttons in game (corners of the pad).