Has Yosemite corrected any of the following? The list below are flaws I have found with Mountain Lion 1) Is there a SHA hash check for the operating system once downloaded so that the operating can be confirmed as authentic? Windows and Ubuntu have methods of verifying the operating system. 2) NO DVD to install Operating system. You should be able to always reinstall the operating system without the Internet. Even though their is a installed OS install if a hard drive failure occurs it would be good to manually install. 3) Mountain Lion does not display installed updates in a single identifiable view. This existed in Snow Leopard. As with Windows and Ubuntu operating systems you should always be able to clearly identify updates on your running operating system so you can determine if any needed updates are missing. 4) Firewall off by default. Many new users probably are not aware their Mac has a Firewall and have never turned the Firewall on. I cannot conceive of a reason the firewall should be off by default. 5) The built in VPN by default does not tunnel data through the VPN. This definitely makes no sense. If you create a VPN tunnel you want your information running through the tunnel by default. What makes this flaw particularly bad is that if you create a VPN and do not check "send all traffic over the vpn connection" It will appear your VPN tunnel is working when you are using the VPN as it shows connected.