das Uber Soldat, under your reasoning you can you fly to an aerodrome without a TAF under VFR without an alternate on a CAVOK day, but going IFR requires an alternate...
Whoa slow down there tiger, its not my reasoning, you can take it up with CASA.
I've often joked with colleagues about the contradictory nature of the regs and this is no exception. There is more than 1 example I can find where a VFR aircraft gets away without requiring an alternate when an IFR aircraft would!
It might be stupid, but when you have idiots running the show stupidity is generally what they produce