Hi guys,
I have the same problem and I just want to add my thoughts.
Ok, fair enough, we don't need two firewalls.
But here is the thing that concerns me. The issue for me is, this asking for permission didn't occur on my mac using mavericks and mountain lion. Why should it appear with Yosemite? I don't understand why it needs to ask for permission repeatedly when I have set the program to allow incoming connections from my firewall settings.
It is also the same case with an app that I have allowed access to use the accessibility feature of my mac. Every time I launch, I have to give permission even though it is already listed on my accessibility preference to have permission. I use this app all the time, and having to repeat this process over and over and over again becomes irritating.
As much as having two firewalls on at a time is not necessary, I believe it is even more not necessary for me have to go through the silly questions if I do chose to leave the firewall on (don't forget the accessibility) and have given permission to let these apps do what they do. To this, I vote that this issue should get some attention by mac and the community.
Have a great one guys,
Peace.