We have the same problem as the early stages Opal at the moment. We Know Nothing! There was talk of transfer beam problems, now there is a Slip beam, whatever that is. We are relying on reports from non engineer reporters who do not know what they are talking about. Pictures so far show some expansion joint problems.
RE Checking, it all comes down to the consulting engineer at the moment. I have not been involved in the design/construction side for many years, but when I was we always did inspections on our own designs and often on sites where we were simply the PT installer and not involved in design to ensure our site crews were maintaining standards. Some consultants were at that time doing "every second floor" inspections on multi storey construction. In one case where I was with a PT company, the "non checked" floor was a transfer floor. In that case, the PT installers from our company requested that I check the transfer beams as they were not being checked by the consultant. That developer/builder has gone bankrupt a couple of times since then.
My son works for a consultant in Queensland doing mostly developer controlled buildings now. They fully inspect all of their own designs before every pour.
Even for my own house (concrete floor slabs and roof and load bearing b;lock walls plus retaining walls) several years ago, the builder had all pours checked by a local consulting engineer before pouring as they had to be signed off with the certifier. I checked the checker!!
Yes, anyone can game the system. But that will happen no matter what rules are in place. My first 6 months in PT (43 years ago) were spent involved in the re-grouting of 2 floors of a 10 storey building and checking the grouting of the other 8 floors. 10 years earlier All were "inspected" by consultants and approved. All were signed off by the PT company as being fully grouted. All tendons of the top 2 floors were completely ungrouted. All tendons on the other 8 floors were fully grouted. But everything was checked and approved by PT company supervisors and consultants.