That's not how my accountant worked with it. It makes sense as...

That's not how my accountant worked with it. It makes sense as well as some foreign stock exchanges apply similar rule.
I had a few discussions about this trader/investor topic and you, if a lawyer, would perhaps agree that Australian regulation is rather vague in terms of defining when you become a trader and when you are an investor for tax purposes. This should be specifically defined, so there's no grey zone. Basically, you set a time limit for which you hold the shares. If you sell within such time frame, you'd pay a tax on it as a trader. If you sell after that period you are an investor. I hold shares in one EU stock exchange and such rule applies there.
Because in a real life people can and often are both. I own some shares for more than a couple years (not exactly for dividends but for their growth), but also I held some shares for only a couple of days.

MiB