Hello! I'm OP, and a fellow namefag like yourself. I agree with much of what you've said, but I do have some major disagreements with you that I'd like to address.
First of all the honesty question. Now this Ines more complicated than namefag or none namefag. In my personal experience I'm completely laid back while posting anon, I can say literally whatever I want without facing serious social consequences. This means I can talk about things that I'd never tell most namefags or people IRL. The only problem is (this is as much of a plus as it is negative.) I can't go into detail about my feelings, and even if I do the person I'm talking to will be gone forever within a only a few posts.
This means I can tell fellow anons some of my deepest darkest secrets casually. Not make a scene out of it, just as apart of casual conversation. For example fetishes that could get me demonised around other IRL, or even in some cases namefags. There are a thousand other examples that I could also list off, that I can say here casually, but would feel extremely anxious if I said it anywhere else. And really it's not about revealing anything about myself, (I don't like causing drama, or derailing threads with my own personal drama, because that's not what's people come here for.) it's more about the attitude of casualness in the face of what should be extreme anxiety. I don't have to say anything, just the ability to say it without consequence is enough.
The only downside to this is that if your community becomes full of unempathetic people who take advantage of this the whole environment becomes toxic. It's like leaving a charity box completely unattended. One bad person can derail the good deeds of ten others by stealing all of the money, because they know they can get away with it. That's why you can only do it in certain communities, and you have to closely safe gaurd the box. Most people on here are refugees from /mlp/ where the whole box itself has practically been stolen. But this doesn't mean that everyone has to be identified at all times, as long as those who are caught taking advantage of our community are appropriately punished afterwards. I'm basically trying to say that there are downsides to anonymity, but for the most part they can be countered if the core is good and the mods are well intentioned.
Anyway I'm rambling. Let's get back to my previous point of relieving secrets, but this time we'll talk about my experience with namefags. You can't be as casual with namefags in the same way you can be with anons. It's like a weird limbo between IRL and complete anonymity. You can tell people things, but only to a certain extent. Because you have to keep track of absolutely everyone in the community and factor in their personality/persona. You can't say x to y because y doesn't like you and could use x against you, or you have to avoid x with y because x could offend y.
Not to mention there are things you won't say at all, especially if you plan to make that place a home. You become obsessed with maintaining a certain reputation, and twist your personality depending on who you're talking to. This isn't to say that you lie, but you omit certain things and tell half truths. There's nothing wrong with this, it's natural and what people do IRL as well. In fact it's probably a good sing of empty and understanding. You can't just talk how you want, when you want, about what you want to certain people. Because if you do, and you mess up consistently you can gain a bad reputation with, and in some cases even be completely excluded from all of your friends, again like IRL.
Many anons on the chans come here to escape IRL drama and social taboos. The last thing they want is to be constrained by another group through similar social pressures.
Although like with anonymity, it's not all one sided. You can as I've recently experienced with this anon >>530
(who is anything but an anon to me.) develop a strong relationship with a namefag, where you're not only not afraid of sharing anything, but actively want to share everything about yourself. You can find those kind of relationships with namefags, but not everyone is lucky enough to find it. Most are stuck in the petty interpersonal drama of ponychan, ponyville.us, or IRL. People are just want someone who they can be honest to. For some that's a special namefag, but for many that's a particular kind anon, or just a chan in general.
To summarise my point, both have there downsides and upsides. But you should respect the rules and culture of either while using said site, as to not make the environment toxic for others.