Why did Apple wait until 2026 to make a foldable iPhone?

Apple (ACTS - appears on multiple iPhones, is the brand of the phone being discussed and demonstrated. Removing it would change what happens in the video)niPhone Fold (ACTS - is the subject of the video, a concept phone being discussed and demonstrated. Removing it would change what happens in the video)niPhone Ultra (ACTS - is the subject of the video, a concept phone being discussed and demonstrated. Removing it would change what happens in the video)niPhone (ACTS - is the subject of the video, a concept phone being discussed and demonstrated. Removing it would change what happens in the video)nSamsung (ACTS - appears on a tablet screen, demonstrating a foldable phone. Removing it would change what happens in the video)nGalaxy Z Fold (ACTS - appears on a tablet screen, demonstrating a foldable phone. Removing it would change what happens in the video)nESR (APPEARS - is the creator's brand, appears as a watermark/logo on screen. Removing it would not change what happens in the video)