The performance of the chip produced by 3nm technology is better, and the more transistors integrated in the same area, the higher the overall performance of the chip.
For example, taking computer processors as an example, a CPU made with 3nm technology is definitely an order of magnitude higher than a CPU made with 5nm technology in terms of the number of transistors, processing speed, and most importantly, power consumption and heat dissipation.
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That is to say, if the chip is the same size, the 3nm process can have more crystal tubes and have higher efficiency. If it is the same transistor, it means that the 5nm process chip needs a larger area. If the 7nm chip wants to achieve the same efficiency as the 3nm chip, it needs several times the space, and others are holding a mobile phone, you need to carry a brick.