What if we show a picture of parked bikes in US and a busy traffic in Amsterdam?
That wouldn't just be a random street in the US. I've almost never left North America, and I've never seen that many bikes parked on a random street on a random day. The only time I've seen that many bikes in one place is at an event's bike valet, or at a school in a super bikeable area.
Yes, NFC the technology works. However, certain applications, like Google Wallet can be problematic and require workarounds (not because of technology itself though)
Not everyone using a custom ROM is doing it for privacy reasons. I see privacy as a perk but I mainly use custom ROMs to keep my devices around longer and to get new features.
Even for those who are concerned about privacy, I don't think NFC is that big of a security hole. I know some people who turn it on only when they're using it, but that's pretty painless.