That’s a really good suggestion — and the good news is: it’s already available in the new Automation 2.0 feature (currently in beta). It allows you to set offsets for sunrise and sunset, like triggering 30 minutes before or after. Definitely a step in the right direction!
That said, I’ve found that sunrise/sunset alone isn’t always ideal. What really matters for many automations is how bright or dark it actually is — not just the time.
For example, 10 minutes before sunrise on a sunny summer day feels very different than the same time on a cloudy winter morning.
So in my case, I prefer to use light level (Lux) values from light sensors — either stand-alone ones or built into motion sensors — to control lighting and other automations more reliably.
Always remember: “If your car is smarter than your home… you’re driving into the future while living in the past” 
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