Limitations of a 28c road tyre? Road surface?

I just had a new bike built and LBS suggested some Padrone 28c tubeless tyres.
I am new to this kind of performance road tyre, previously having used some Scwalbe Marathon Plus tyres which are bulletproof and can be ridden basically anywhere with zero chance of puncture.
Do I need to be super worried if for example the road becomes a little dusty/gravelly? I'm gonna be riding in a very rural part of France and many of those roads are far from ideal.
I am new to this kind of performance road tyre, previously having used some Scwalbe Marathon Plus tyres which are bulletproof and can be ridden basically anywhere with zero chance of puncture.
Do I need to be super worried if for example the road becomes a little dusty/gravelly? I'm gonna be riding in a very rural part of France and many of those roads are far from ideal.
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As to gravel - again you'll be fine. Just watch corners with loose gravel as you would with all tyres.
And watch Paris Roubaix to see how well tyres can cope with the rough stuff?
If not, you may want to have a think about running tubeless tyres.
http://themartincox.co.uk/review-maxxis-padrone-700x28
http://road.cc/content/review/190493-schwalbe-g-one
Side wall slashes not so much! And vs A Marathon Plus which frankly laughs in face of nails/flints nuclear bombs you'll loose a some durability.
This said the Padrone's should feel a lot nicer! Marathons are remarkable good on gravel and such but bar deep gravel 28mm should be fine!