The limitation on the number of external monitors is due to the number of display controllers on the chip. Apparently they take up a considerable amount of spac

The limitation on the number of external monitors is due to the number of display controllers on the chip. Apparently they take up a considerable amount of space on the die. The base M chips only have 2. They made a technical trade off that we are all paying for. It is unlikely they will ever fix it. :( Daisy chaining monitors via thunderbolt has always had problems since it came out. Some monitors just don’t play nice with each other.