I'm saying there is a strong correlation of laggards across fields. If you have a new service, people that lag in another are not likely to take it on initially. So if you have design choices to make, make them to sell to the people that are likely to start using your service first.
Worrying about the rest is a waste of time -- and new companies don't have time to waste.
And I'm saying if you claim to be an expert web app developer (implicit in the "3 day claim"), dynamically rendering to any resolution should be a piece of cake.
Worrying about the rest is a waste of time -- and new companies don't have time to waste.