I have XS Max. Tested Seaboard 5D app on girlfriends XR to see how well app worked with haptic only, and was very disappointed. Super sucked by comparison. So what I know know is:Are you sure the music app does no longer utilize the 3D touch functionality? They afaik only deprecated a few APIs but I don‘t think the pressure detection is one of them.
A) a “Pro” without real 3D pressure is not for me.
B) afraid to upgrade to iOS 13 if it breaks/disables the real pressure hardware on third party apps that need it, like the Seaboard 5d (that I use daily and LOVE... it’s the whole reason I got the XS Max: I wanted 3D pressure and largest screen possible for the S5D app)