Thin, light laptops rarely meet expectations in terms of power and portability, according to an article on MakeUseOf, because they have smaller batteries that offer limited capacity and are prone to draining faster under sustained loads.
They also tend to sacrifice performance because smaller laptops mean less space for cooling, which limits how much power they can use before they get too hot and throttle the performance.
In addition, thin laptops have problematic keyboards and trackpad which have shallow key travel, resulting in a flat and unsatisfying typing experience., while their trackpad can be stiff or unresponsive, making gestures and clicks less precise.
The article also states that such laptops usually have limited ports and often require dongles and adapters to connect external monitor or USB drives at the same time.
Moreover, they tend to be not repairable because some models have soldered components, meaning the RAM and storage are permanently attached to the motherboard and upgrading them is not an option.