Turrella station in Sydney has maintained full function during the (still ongoing) elevator installation and stairs rebuild. They've installed temporary stairs on one end. The contractors can be as slow as they want, all it does is make people have to walk an extra 50m.

It's had some shutdowns, but for other work (wires & tracks & signals) and typically short.

I can sort of see why for some of them, if they're realigning and completely redoing some of them then that does make sense, but I'm not really sure about the whole closing the entire station for that long part. Obligatory I don't live in Brisbane, but I do love in Melbourne and we've had a lot of stations completely demolished and rebuilt in less time than that. I'm guessing there's some tradeoff between money and time though. Easy to get stations up quickly if you pay people to work on it 24/7, including weekends but that does blow the budgets out big time

But even still, I'm not sure an entire 10+ months of closures for a cheap price is the best tradeoff to be making, though I suppose it is better than spending double the amount on half the stations