All airplane manufacturers have to design for possible uncontained rotor burst. Its in the regs along with advisory material that typically satisfies the regulators. All of this laundry list has to be considered. It's the combinations that turns an incident into an accident. Aviation designers and regulators know that.
There is no need in postulating "what-ifs" regarding the damage as it has already been taken into account in the design. However there is no practical way of ensuring that all the possible what-ifs won't get you some day, so the design intent for both the engine and the aircraft in combination is to minimize to a practical extent taking account of lessons learned.
In this case the aircraft landed safely so the minimization worked
Behind the scenes there probably are some new lessons learned, so I suggest that we await the ATSB etal. reports