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Well it is shorter but wider than Subi. Fence to fence it is 175m/140m, with the added 7 rows in front of the raised ground tier it will still be 163.8m/128.8m which is nothing to celebrate. That's only 5m narrower than Subi and the Adelaide Oval and 3m wider than Kardinia Park in Geelong.
This stadium has a steeper rake angle than Subi but I'd still hate to sit on those bumped in seats for a Rugby or Soccer match.
Optus Stadium is only the one off special event option for Rugby in WA. Anything more and we'd see the same thing all over again with crowds as happened to the Force at Subi and Reds at the WACA.