I have heard Pennsylvania's style of flag referred to as a seal on a sheet. While our flag is not literally our state seal in the middle of the flag, you probably have to have to google image of both to prove that it is not. While it is not a bad flag, the complexity makes it hard for the average person to make a image of the flag or even quite remember what all the elements of the flag are. So it isn't easy to just slap images of it or stylized images of it on things as a unifying image of our state. If you want flags that are good examples of this, see the Texas or Chicago flags. Luckily Pennsylvania has the PA Keystone as our easily reproduced and recognizable symbol.