Katanaman
The current rostering practices are mined with "other than in abnormal circumstances" "will not normally be" etc which hold absolutely no water.
As an e.g. I had a change to my roster while at the outport which contravened a "other than in abnormal circumstances" paragraph. I asked what the abnormal circumstances were that lead to the change, to which they replied "we are short of crew". My answer "but you are always short of crew, that is not an abnormal circumstance" They came back with, "it is legal, are you refusing the duty?"
Flight Tim Limitations is a misnomer, in CX they are treated as Flight Time Goals, and as such unless it is in black and white, AND not open to interpretation, expect it to be abused by the company.