Is the eyepiece of SLR viewfinder easy to accumulate dust?

If dust enters from the optical viewfinder, dust particles will generally fall on the ground glass imaging screen above the reflector, while the eyepiece of the monocular viewfinder is almost completely closed, so dust cannot enter through the eyepiece, but through the open lens bayonet with the lens removed. Therefore, after taking off the lens, it is necessary to cover the body cover to prevent dust from entering. The picture below shows the body cover installed on the SLR body after the lens is removed. The body of the lens should be stored like this.