Tech does last better but many on mumsnet don't buy consoles, phones, Ipades etc... for young kids hense the pre-teen (8-12) range being when things start to teeter off (less interest in age specific toys more interest in longer lasting tech which starts to accumulate).
A balance bike for a one year old is not going to last until 8 year old it wont fit that long, bikes need upgrading because kids litrally grow massively over the space of 8 or so years.
but the main point is PP is saying that only buying 1 toy, an item of clothing and a book with a stocking would 'accumulate' specifically without ANYTHING else being bought through the year is utter rubbish.
Young kids will grow out of things quickly and even if you found magic toys that are equally as suitible and played with for a 6 month old as 8 year old if you only buy 1 per year they still only accumulate EIGHT over their lifespan not an exorbitant amount.
How are people NOT buying things and yet somehow magically accumulating loads? unless they have lot of other people gifting things to their kids which is 'privilage' not something to feel 'rightous' about.
Many of us do not have anyone else doing that for us so have to buy all the stuff ourselves.