I agree with the OP on this.
When PoFA was introduced, the then Government lorded it as 'a modern Act of Parliament' which was 'worded in legally tight manner' and 'designed to be totally understandable by individuals with no legal background' (admittedly my paraphrasing).
If you examine the Act then you will see that this is the case.
The wording of 9(2) demonstrates that exact point;
The notice must-The wording of 9(2)(e) further reinforces that point if it were needed;
The notice must state blah blah blah
If a notice 'must state' something and it subsequently fails to 'state' it then one quite reasonably imagines that this is a very good 'basis' for making such an assertion?
Otherwise, what purpose do the requirements 9(2)(a-i) perform if one could just introduce subjectivity (to such an extent as was needed) in order to ignore the precise wording of the Act itself and therefore always arrive at a position where one deems a NtK as being compliant?
The Act was deliberately designed and worded as to deliberately AVOID such subjectivity - that is the very purpose of tight wording and total objectivity.
If you want ever wanted to find an Act which exhibited the exact opposite then you should examine the Animals Act (1971).
I cut my teeth on the Animals Act and I can tell you that it was arduous.
Examine this history of interpretations of the Animals Act over the years - it is mind boggling.
Read it here;
This is the EXACT reason why modern Acts were worded in such a strict manner.