The time waiting in line is irrelevant because that's not what's being discussed here. We're discussing eliminating the 2 guests per primary.
Right now, you and your wife and your mom would technically be able to bring 2 more guests each if you wanted to, for a total of 9 people getting into the lounge instead of just 3. So that would be 6 more people taking up space in the lounge. Multiply that by each primary bringing in 2 guests and crowding gets out of hand.
Now, if you wanted to argue seperately that in your particular case eliminating the guest policy will cause others behind you to wait in line longer, then we can do that
. I hear you, but yours is a unique case and I highly doubt that everyone or even most people that are guested in have their own Platinum card. They don't so they wouldn't be there if the guest policy were eliminated.
I still think it would take faster to get in when nobody can guest others in, resulting in less people in the queue and in the lounge overall.