If flying in the local area VFR on a CAVOK day, there is approximately zero chance of me having to utilise so much reserve fuel. If flying visual circuits at my home field, which take about 4 minutes each, why must I stop when I have 30 minutes fuel remaining?
That is actually covered by the exception:
"except for ... taking off and landing at the same aerodrome/operating site and remaining within 50 nautical miles (nm) of that aerodrome/operating site..."
Are there sensible scenarios you can think of which wouldn't be?
Actually I just thought of one:
Aircraft A is on a VFR cross country from X to Y, and joins the circuit at Y for some practice. An identical Aircraft B gets airborne from Y into the circuit. Both get down to 30 mins fuel. Aircraft B can keep going. One interpretation of the proposed rule is that Aircraft A must land. That seems a bit odd, doesn't it?