Santa doesn't bring big gifts here, he just brings the stocking fillers and a maximum of 3 gifts. But there's conditions attached! DS (nearly 5) knows Santa only brings things the elves can make in the workshop so roller skates, scooters, toy cars, footballs, dressing up costumes etc would be OK to ask for, but not TVs, playstations or tablets for example. A pedal bike would be ok but an electric motorbike wouldn't. And no specifics - so if he did ask for a bike he couldn't say "the one I saw in halfords last week" but he could say a red bike or a bike with a bell - the elves have to make it afterall 😉
He knows us and his grandparents also buy him presents (if he's well behaved!) so he has a separate list for that. And obviously if he wanted something specific off that list I'd try to get it. But he understands he doesn't get everything on the list and if he desperately wants something it needs to go at the top! His birthday is three weeks after xmas though so if he's really gutted about not getting something he can get it out of his birthday money.
It's always been a bugbear of mine that some people do huge piles of (or massively expensive) presents from santa and then some kids are left wondering why santa only brought them something small/inexpensive. So we keep it simple. It also means I don't need to use the "Santa won't bring you anything" threat because I can just say I won't get him anything instead lol. And when he finally does realise there's no Santa it won't be such an adjustment or a let down, because Santa was only ever an extra rather than the main present giver, if that makes sense. Which it probably doesn't