because firstly it is not our job to force people to have work done that they don't want doing, wether it is safe to leave as is or not. Secondly an EICR is a statement of current condition, so you would list all issues and the C1,2,3 coding directs the customer to the severity of those issues. ALL C1,2 issues would require an unsatisfactory result, a C3 would not, although carrying out the recommended work would improve the general safety of the installation. But at no point does the carrying out of an EICR demand that you or the customer carry out any work.
if you were to carry out a EICR and place only C3 codes against anything you found, then say it is unsatisfactory, you would be in the wrong and liable to some form of prosecution.
Right or wrong the ESC and the IET have deemed this to be the case, and in your OP the remedial work required to bring upto 17th from 16th would be fairly minimal to quite costly dependant on the installation requirements, say maybe 4 square D rcbo's at £50 a pop plus bonding perhaps.
and you do not sign to say " it is safe" you sign to say that you have tested the installation and made an assessment based on that inspection and testing procedure.
this thread seems like it could of been started by DC