The more interfaces that must seat, the greater the opportuinty for there to be an error of judgement in the design, just because normal human brains can't juggle the increasing variables 3 dimesionally without physical feedback and iterations of design. This is why when doing multi unit cases, with analog modelwork especially, or with docs new to IOS implant scanning it is wise to make a check fixture/verification jig to ensure that all interfaces seat fully even if only one screw is installed and to check that each abutment screwed down individually and by itself only produces full seating of all abutments.
Edit: this, locally at least, is called the one screw test.
There's a lot happening at once.