sudo had many security bugs. sudo would be more secure if it had access 4110 instead of 4111. Only users of some group e.g. sudo would be able to execute sudo.
No. `sudo` didn't have so many issues _where the user was totally unauthorized_. The problem is that there were many ways to workaround the limits put on what users were supposed to do. But that is not going to be fixed by marking it 4110.