Greeneyed - no children don't need toys and adults don't need mobile phones. Because a child might benefit from some toys doesn't mean a. They need them or b. they should have three each every birthday and Christmas/so many they don't appreciate them anymore. Need isn't relative in that context.
I find it interesting that so many people are missing that the op's children already have toys, her husband thinks the children don't need more because they don't look after the ones they have by losing bits straight away as the op said meaning they need to be chucked or not tidying them up, he had also not banned her from buying any toys but from buying any more than she already has. Nor has he banned presents or Christmas, just more toys. He's unreasonable for dictating this in my mind but not feeling it especially when the op has explained she has form for overbuying.
Buying too much for children just teaches them to measure love in terms of stuff. I think it is about balance and I think that's what the op's oh is saying too just in a controlling way. I do not think it is fair for people to say it is an objectively unreasonable position to take.
Some of the stuff on here about Christmas being about toys? Wtf? Not Christian but no time is ever about toys, Christmas is about family and being jealous of other children and showing love in quantities of toys is absolutely crazy. Someone will always give more stuff to their children than you, that's quite a good thing for a child to learn about - how toys are made, what they cost, where they come from and what Christmas and families are actually about, what love is and how it is really shown rather than feeling they are unloved because they "only" got an iPad rather than an iPad, an Xbox and a trip to Disney like someone in their class.
Some kids can have all the stuff they ever imagined and none of the things they really need. That's apart from the silly plan some people are putting forward to undermine the oh in a tit for tat way buy just buying more stuff anyway.