Tim Hardwick, MacRumors:
Force Touch can be used in watchOS 6 to reveal hidden menus on Apple Watch , such as options to clear notifications and customize the current Watch Face. These options will no longer be accessed using the Force Touch gesture when watchOS 7 is released. Apple’s new Human Interface Guidelines for developers making apps for watchOS 7 confirms the change:
Firm press and long press. In versions of watchOS before watchOS 7, people could press firmly on the display to do things like change the watch face or reveal a hidden menu called a Force Touch menu. In watchOS 7 and later, system apps make previously hidden menu items accessible in a related screen or a settings screen. If you formerly supported a long-press gesture to open a hidden menu, consider relocating the menu items elsewhere.
Several native apps in the watchOS 7 beta already reflect the gesture’s removal. For example, the Force Touch gesture for the app layout Grid/List View has been replaced by a menu option in the Settings app. Similarly, changing the Calendar view must now be done in Settings, while the gesture to Change Move Goal in the Activity app has become just another menu item. The Customize Watch Face menu is now accessed via a long press.
Not a particularly surprising change; even I called it, and I am a dummy. Force Touch and 3D Touch were both interesting experiments in different interaction models, but they were invisible and implemented too inconsistently. As of the first beta of Big Sur, Force Touch trackpad options remain in MacOS, but I suspect not for long.