Actually, I think it is a common misjudgment, that the issue with the keyboard is due to thinness. If we compare a laptop with best keyboard, with normal keyboard and macbook pro in dimensions, the reasoning with laptop size or weight does not stand:
MacBook Pro 2018 (13")
Height: 0.59 inch (1.49 cm)
Width: 11.97 inches (30.41 cm)
Depth: 8.36 inches (21.24 cm)
Weight: 3.02 pounds (1.37 kg)
MacBook Pro 2018 (15")
Height: 0.61 inch (1.55 cm)
Width: 13.75 inches (34.93 cm)
Depth: 9.48 inches (24.07 cm)
Weight: 4.02 pounds (1.83 kg)3
ThinkPad X1 Carbon Gen 6 (14")
Height: 0.63 inch (1.595 cm)
Width: 12.74 inches (32.35cm)
Depth: 8.55 inches (21.71 cm)
Weight: 2.49 pounds (1.13 kg)
Dell XPS 13 2018
Height: 0.46 inch (1.16 cm)
Width: 11.9 inches (30.2 cm)
Depth: 7.8 inches ( 19.9 cm)
Weight: 2.67 pounds (1.21 kg)