The thing is if you start with a frame it takes up more space, and it’s more difficult to move finished portions unside. Without the constraints of the frame you are free to position your portions where you want before merging.
Okay so in reality you don’t complete the entire frame before starting anything else. It may be 90% complete after initial sorting and flipping of pieces, so there are gaps in the border through which you can move finished portions.
Additionally, I would typically keep most of the unsorted pieces outside the frame and then build portions inside the frame.
The thing is if you start with a frame it takes up more space, and it’s more difficult to move finished portions unside. Without the constraints of the frame you are free to position your portions where you want before merging.
Okay so in reality you don’t complete the entire frame before starting anything else. It may be 90% complete after initial sorting and flipping of pieces, so there are gaps in the border through which you can move finished portions.
Additionally, I would typically keep most of the unsorted pieces outside the frame and then build portions inside the frame.