There's No Redo On This One
You get one shot at this. The ring comes out, your hands are shaking, and whatever happens on your partner's face in the next second is the whole point. That moment happens only once.
That's why choosing me means you get someone close enough to catch every flicker on their face, and far enough back that your partner never once thinks to look for a camera. You get someone already watching before you're anywhere near down on one knee, so nothing happens in the gap between parking the car and asking the question. You don't get a second take, so whoever is capturing it has to be ready before you are.
You get to stay fully in your proposal and walk away with the real reaction!