The Facebook post by The Guardian had an interesting set of headline pictures:
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Now there's a few ways to look at this.
First of all, the three carriers they mention are all LCCs but, more specifically, have Y only cabins. There's no restriction if anyone on those airlines wants to use the front toilet (and yes I am well aware of the potential irony that QF will actually enforce the front toilet as J only). Of course, the optics is that an LCC takes better care of their cabins wrt toilets compared to a legacy carrier a la QF; even the ratio of 90 per toilet seems rather staggering (years ago, when QF reconfigured their A380s, we on AFF were stunned that QF would go to a 50 per toilet ratio in Y).
I realistically wonder what was anyone thinking when they settled on 2 toilets to service 180 Y pax. Now of course you're all saying, "revenue, simples". That's like saying QF would get rid of seatbelts and/or go to standing room only in Y if it were given the chance, but for some reason (notwithstanding basic safety and CASA rules) they aren't (or aren't yet), so it seems there's some element of human decency or whatever you want to call it in the decision making.
Second, The Guardian ironically didn't mention BA. Of course, when BA have set aside enough rows for Club, the ratio is still in their favour compared to the fixed configuration of QF (assuming that BA also police their front toilet to be used by Club only). But all in all, no one really wants to be winning this kind of p***ing contest.