The primary reason why 3D TVs are no longer watchable is due to the discomfort and eye strain experienced by viewers. The technology, which requires wearing special glasses to create a sense of depth, often leads to headaches, dizziness, and fatigue. Additionally, the quality of the 3D content has not kept pace with the advancements in 2D technology, resulting in a less enjoyable viewing experience. According to a study by the Consumer Technology Association, only 5% of consumers own a 3D TV, and the number of 3D movies released has significantly decreased over the past few years.

The discomfort associated with 3D TVs stems from the way the human eye processes images. When watching a 3D movie, the eyes must focus on two different images simultaneously, which can cause eye strain and headaches. This is particularly true for extended viewing sessions, as the brain struggles to interpret the dual images correctly. Furthermore, the glasses required for 3D viewing can be cumbersome and uncomfortable, adding to the overall dissatisfaction with the technology.

The decline in the quality of 3D content has also contributed to the unwatchability of 3D TVs. While 2D technology has seen significant advancements, such as higher resolutions and better color accuracy, 3D content has not benefited from the same level of improvement. This discrepancy has led to a less immersive and enjoyable experience for viewers. Additionally, the production costs for 3D movies and TV shows are higher due to the need for special cameras and editing processes, which can result in a lower overall quality of the content.

In conclusion, the discomfort caused by 3D glasses, the strain on the eyes, and the decline in the quality of 3D content have all contributed to the unwatchability of 3D TVs. The low adoption rate and decreasing interest in 3D technology further highlight the challenges faced by the industry in making 3D TVs a viable and enjoyable option for consumers.