To build a folly is essentially to do something a second time, something at an inopportune moment. That something is always the memory of something forgotten, about which we can paradoxically say "There it is again."
Follies were misunderstood, purposeless constructions. They were often only small, extravagant gestures in a garden, easily whisking off the imagination to distant lands, a sort of time capsule built to awaken the memory and induce surprise in passers-by. They marked locations, organized secondary paths in a park, or simply predicted the arrival of better times—a demarcation, a sacred spot, a mysterious trail, a hill whose tragic rocky nature begged for a tower, a party, or the arrival of summer.
“It is demonstrably true that things cannot be other than as they are. For, everything having been made for a purpose, everything is necessarily for the best purpose.” — Professor Pangloss
No matter how many screen sizes our artboards account for, some user’s browser will break loose from our prescription. With users resizing, rotating, and zooming the screen, new devices stretching, squashing, curving, and cutting (e.g. the speaker area in iPhone X) the screen, the sizes become infinite. Good luck making an artboard for each one of them.
Artboards are a lossy format. Using artboards in a handoff is a lossy process. When we pitch a finite number of plans against an infinite number of situations. We inevitably get in-betweens. Once there are in-betweens, there are unknowns. Once there are unknowns there is guesswork. Once there is guesswork, there are surprises. Engineers take the path of least resistance. We are ones who paved the path.