Inequality doesn't come from how much kids do or don't get at Xmas.
Children's life chances are affected by whether there is any abuse at home, where they live if their local schools are under-performing, whether they can afford out of school activities, whether their parents can help them with school work and they have a quiet space with access to books/tech to help them study, even what sort of holidays their parents can afford because that can help with social development.
It is the worst form of virtue signalling imo to say you earn 7 figures but spend two fifths of sod all on your kids because you have 'Christmas traditions' and the moral high ground.
It is more than fine to spend what you can afford on your dc at Xmas, whether that's £50 or £1000. It is so much more important to be a kind, loving and supportive parent which costs nothing.
Also, unless you are never going to buy your child a laptop, phone, significant Lego kit or ipad, then at some point in their lives you will spend more than £30 and a tangerine on them.