from picamera import PiCamera
from time import sleep
camera = PiCamera()
With the preview to the camera and the sleep commented out, the image produced is significantly fuzzier than the image produced with the time delay and preview functioning, as evidenced by the two photos.
This poses a negligible problem for most people who are using Raspberry Pi just for experiments. For those that want to do it more seriously, setting the camera going a few seconds before it is used is a great advantage despite the increase in power consumption.
Camera used UV Pi camera
Pi used- 3B+
Software: Raspbian Buster, Thonny