I think it's better not to change the scale here, which will affect the layout of the entire page.

initial-scale initially sets layout viewport to be the same as vistual viewport

initial-scale = 0.5 means that the layout viewport will not be affected after the user touches the screen to zoom, because the layout is not affected

initial-scale = 0.5 is equivalent to shrinking the screen
initial-scale = 2 is equivalent to enlarging the screen

when initial-scale = 0.5, the layout viewport layout viewport = ideal viewport / 0.5 = 750
zooms out when the layout viewport is displayed in the ideal viewport of 375.At the same time, the visual viewport corresponds to the width of the layout viewport of 7500.So the visual viewport is equal to 750mm