Learn to read first.

On Android, all photos received from Whatsapp are stored automatically in the Whatsapp folder, making it very easy to copy to the PC.

On iOS, its shows ALL the pictures in the Camera roll and thus it clutters all your images because they mix the photos taken with the Camera with the pictures you receive from Whatsapp.

If you want a separate folder only for Whatsapp photos, you can go to settings and turn off "Save in Camera Roll" and then the whatsapp photos will not show in camera roll anymore. But if you want them saved in the Whatsapp folder, you must do it manually, for each individual photo, which sucks.

I'm not an Android fanboy, I have an iPhone 13 Pro right now, and yes, sometimes iOS really sucks and is limited in functionality.