https://www.wsws.org/en/articles/2006/01/fire-j09.html

https://en.wikipedia.org/wiki/Piper_Alpha


https://www.nuffield.ox.ac.uk/politics/aberfan/tri.htm

The first example is of a public enquiry that never was(Labour)
The second example is the Cullen report. I cannot recollect any criticism of it's findings. It lead to a step change in safety, not only offshore, but in other industries. It was largely responsible for the growth of an entire safety industry and no sane person would argue for its abolition.
The third example the Abervan Disaster was chaired by a S. Wales barrister with much experience of mining law. Many felt the enquiry would be a whitewash as so many other investigations into mining fatalities. In fact the coal board was held responsible and changes to legislation quickly followed modifying practices in quarries and on tips. Indirectly it advanced soil mechanics and ground investigation in general. Few disputed the findings.
    The chairman for the coming grenfell tower block inferno would also cover every aspect of the disaster. Do not forget all interested parties can contribute.