Ok! I wasn't sure if you had already decided not to for sure, and I didn't want to rile. But if you're still undecided I'll stick my tuppence ha'penny in.
I think it would be utterly foolhardy to reject all scans. You can decide to refuse other tests if you wish, but I think you should have the 29 weeks anomaly scan, if nothing else. Nobody wants to think of bad outcomes but it does happen. Whatever you decide to do, I think the important reasons are because of the following possibilities:
a) low lying placenta. If you have one of these, you need a C section. No two ways about it. It cannot be diagnosed other than by scan. If undiagnosed, the first sign can be bleeding in labour and even with a crash section it can compromise a baby's health (worst case fatally) and cause massive bleeding for the mother (again, worst case fatally).
b) can diagnose conditions that are treatable in utero, but have poor outcomes otherwise.
c) if a condition that requires immediate specialist intervention on delivery is diagnosed, you can arrange in advance for delivery at a centre that offers the care needed, which can make a permanent difference to outcome.
d) if an untreatable condition is diagnosed, you can make decisions in advance (whatever your personal views might be, to let nature take its course or get it over with).
I hope none of those ever apply to you. But if you think you'd rather make informed decisions before labour, rather than immediately on delivery, I'd urge you to get at least one scan.