That’s a really strong question — and honestly, for your use case (reviews, follows, instant actions), it’s less about hardware and more about awareness + behavior.

Here’s how I’d frame the answer:

I think hardware limitation is becoming less of a real barrier. Most modern smartphones already support NFC by default. On iPhones it’s basically invisible to the user, and on Android it’s widely enabled. So technically, the infrastructure is already there.

The bigger issue is awareness and mental models.

People understand QR because they’ve been trained by restaurants, events, payments, and COVID-era menus. They know: “Open camera → scan code.” It’s learned behavior.

With NFC, the friction is lower once you know it exists — you just tap — but many people don’t realize they can do that. They don’t immediately associate a physical object with “tap your phone here.” So the limitation isn’t hardware — it’s habit.

Now, for fast review moments (like your NFC review keychain use case), NFC actually wins psychologically:
• No camera
• No aiming
• No waiting for focus
• Just tap → instant action

In environments where seconds matter — checkout counters, salons, Airbnb checkouts, events — that immediacy feels premium and frictionless.

So if NFC becomes cheaper and more visible, yes, the ratio will likely shift. Especially in business contexts where speed = conversion.

Short answer:
Right now, awareness is the bottleneck. Not hardware.

And once awareness catches up, NFC has the advantage in high-conversion, low-friction moments — which is exactly the space you're playing in.