My 13 year old Pentax K100D DSLR has sensor-shift stabilization. It’s been abused from carrying in a pack over very rough terrain and many falls. The system still works as well as the day I got it.
I was concerned about fragility of the sensor-shift mechanism when I bought it. My research indicated that, as always, Pentax had heavily over engineered the system for ruggedness and super long life (like my classic K1000 SLR). In addition some experts I read indicated that the sensor is locked in position when not actively taking photos and has excellent shock resistance mechanisms when actively taking a photo.
While I can’t say for certain that Apple has done as good a job, it would very much surprise me if they didn’t design a system close to as rugged as my Pentax.