The redesign of this part of the house should be done by considering all of the elements of it (steps, weather protection, separation of people from vehicles, etc) then when you have a good design approach you should consider if a pair of doors would reinforce that approach or not. Don't design one element at a time. I suspect that might be how the house got the way it is now.

I don't like to design from a photo with no knowledge of the environment but off-hand I'd say there is no sense of arrival at the front door in spite of the huge piece of glass above it. The entrance needs something that relates to people.

I replaced my old doors with a double in my last house partly because moving things in and out required taking the screen door and doors off the hinges several times which is a giant PITA. You do need to buy quality insulated doors with really good weatherstripping and make sure they are installed by pros. Even full light ones like you prefer can be double paned with low e gas and insulated blinds in between the glass I think. Thermal curtains could be used when needed for privacy and insulation. The style and color of the doors is more important than the number in terms of it looking good with the house in my opinion, but I am NOT a designer or architect, so take that as just my 2 cents.