The PlayStation 4's DualShock 4, is the first major overhaul to the brand's flagship controller since its introduction in 1998. It featured redesigned Triggers, a mono-speaker, a clickable multi-touch pad, and a light-bar that can be used in conjunction with the PlayStation Camera, as well as a means to identify player number for local multiplayer. Because many PS4 games are on other platforms, these features sometimes go under-utilized, as you won't find a trackpad or gyro sensor on an Xbox One controller.
With the PS5 looming, a new Dualshock is inevitable. Should the new controller do away with the DS4's added features, or should they stay and be refined? IMO, it makes more sense financially speaking, to build on the DS4, rather than once again redesign the controller. If PS VR will be on the PS5, then they'll surely need to keep these features for VR. I think the only thing I would change, is reducing the size of the light-bar. I think the current size just looks needlessly large.
I think the DualShock 4 is a fine controller, and its features like Motion and Touchpad have their place. With Gyro aiming being popular among Switch/PC owners, I think Sony needs to incorporate it more into their own games, and encourage third parties to do the same as well.