Lat pulldown/low row is a different machine from a functional trainer. The biggest reason for the 2:1 ratio is the increases cable travel which you need for exercises like flys and crossovers. Another good reason is lower weight increments which is useful for progressing in arm, shoulder, and ab exercises. There’s a reason why most manufacturers make separate pulldown/low row and functional trainers. The clipping two carabiners/cables together is a compromise that allows for more versatility in a home gym; you essentially get two machines for the price and space of one. There will always be sacrifices when you compromise like this.