Just from a different perspective. We have aluminum stacked doors with Crimsafe screens. Initially, DH wanted timber bifolds so you can see who was more persuasive
I like the look of bifolds but didn't want them in my own home from a practical perspective. I hate insects in the house and we live in an area with lots of mozzies (backs onto bush land and a creek) and flys (regional area near farms). I haven't seen any practical AND aesthetically pleasing way if integrating screens and bifold doors. I've seen the retractable ones but the mesh is not sturdy enough to withstand young children and pets. There are also stacked ones but they defeat the visual look of the bifold doors. So that ruled out bifolds.
We went with stackers so that everything stacked back and we could have the uninterrupted aspect if we wanted. It feels light and airy and I am especially happy in summer when I can leave the house with the glass doors open, Crimsafe screens locked and not come home to a stuffy hot box. Ocassional my when we have a party, we will open everything up for that free flowing feel.
We went with aluminum over timber for the low maintenance. I do like the look of timber but the practicalities of living in an area with humid summers and damp winters meant that timber swells and doors and windows jam. We have friends who can't open their doors/windows during wet weather and just accept it as part and parcel of life. I'm a creature of habit and it would annoy me to no end having to change my routine based on the weather. Or not be able to air out the house. We went with a chunky aluminum frame that looks better than the ordinary ones. Ours are powder coated white and from the street, it looks very neat, tidy and inviting without the coldness usually associated with aluminum.
We have plantation shutters and roller blinds over our doors. They are built under a pelmet type recess so it still has that modern look with clean lines. The pelmet is made of timber, goes up to the ceiling and painted the same colour as the walls do it just blends in. I definitely wanted some sort of covers for privacy and to keep in the warmth.