I agree. My plan is about to finish and in comparison the new plans are punitive and inflexible.
The 2Gb was enough to get by when no wifi was available and voice roaming was a good deal and I used to often recommend my plan to colleagues.
Now I cannot find anything even approaching my current plan. I was expecting a price increase of course, but the inclusions have all but disappeared. Nothing appropriate for frequent travellers.
Even the "build your own plan" option (which I was going to take up) has disappeared without warning.
It is disappointing, as generally, I have been very happy with my plan and the Optus service while overseas.