The issue is that the 'extra' places are limited. All appeals are competing for any extra places that can be made available.
You have to have an exceptional case to get one. If you are out of area in addition to that, if it comes down to it being nothing to choose between several kids - apart from where they live - then the out of area kids will always lose.
My understanding is that for the last couple of years, with a shift in the pattern of applications, and there being a bigger demand and increased pressure on schools in Trafford the whole process of getting in and then appealling has increased.
Anyone who hasn't got a really good case and is borderline needs to be sensible in their choices. There's a lot to be said for playing it safer rather than aiming for the 'best' choice for these kids. It solves a lot of heartache.
My friend knows which kids have a realistic chance of getting into the grammars and which have no chance, but the parents know better... And it's my friend who has to deal with a huge amount of the fallout at school when the kids have built up expectations, and planning with friends who have applied to the same first choices and then their whole world comes crashing down as reality hits. She's having a nightmare ATM because so many parents just aren't being sensible about it, have applied for a bunch of schools their kid didn't have a realistic chance to get in and then have ended up with an allocation completely off their radar. Management expectation of school applications just isn't working with the parents. In her area it's being compounded by the fact that some of the less good kids who aren't grammar material have traditionally applied to a couple of schools in neighbouring counties. These have seen a massive improvement in reputation and that's driven demand on these schools too - so they are no longer getting in there as they are out of area and Trafford is therefore having to find spaces internally for a bunch of kids who were going outside.
The number of Hong Kong Chinese who have moved to Manchester, Trafford, Warrington and East Cheshire is huge - there are brokers pushing the area because of the schools. There are buyers who are snapping up properties for cash which has pushed up prices significantly in some places. It's really insane.
My son's primary (outstanding good area but under subscribed) has had a bunch of kids move there. Lovely lovely kids. But the aspirational parents are using it as a stop whilst they try to get a space at some of the good preps or grammars. They are openly admitting they are 'waiting for a space elsewhere'. And they are being tutored within an inch of their lives. It's a whole new level of competition that's opened up - seeing that the expected standard is 360 but kids only above 379 being accepted, in this context, does not surprise me in the slightest.
It's leading to more appeals from pushy parents with increasingly tenuous claims. The OP's sounds suspiciously like one of these that is desperately clutching at straws.
It's stressful and damaging to some of the kids. And it's coming from the parents to a huge degree rather than Trafford being 'unfair' in their allocation. Parents going for schools that are so oversubscribed with kids who are at best borderline is fueling it. Then dragging them through the appeals process because their fall back options arent prestigious enough is awful.
The parents aren't putting their kids wellbeing first. And Trafford ultimately know this - and with so many appeals like the OPs - the argument about damage to the kid for not getting their first choice, doesn't really stand up.