The JW's have it figured out. The perfect world right here on earth where the lion plays with the lamb. Lions also no longer eat meat. They eat straw now and I guess their teeth have changed. Hard to eat straw with those pointy teeth.

On the serious side, get rid of greed and let everyone become concerned with their fellow man and this earth could become the perfect world. There would still be problems but we would work together toward common gain to solve them. Misinformation and the love of money prevents all of this now. Would it all matter as an atheist or agnostic? Would it improve our vision and outlook? Certainly because life has the meaning that you give it. Harmony is much better than earthly strife. This is why people invented gods and stories of heaven. Rather than false hope we need real hope.

The whole point is NOT to pooh-pooh the entire question by stating the obvious: a perfect world is probably not possible! This is theoretical!
The QUESTION is twofold:

1. would political, economic, and social harmony on the MACRO level affect you, your friends and family, by making you happier? Better people?
2. would it matter? As an agnostic?
   OR as an atheist, would it improve your outlook as to, for instance, the perfectability of mankind? And would THAT matter, since life itself is meaningless anyway?

No, a perfect world is not possible. You can blame people, they're why we can't have nice things. Whatever utopia you want to envision, some percentage of the population (hereafter referred to as "jerkwads" ) will find some way to break, abuse, or ruin it for others. Full disclosure: in at least some versions of a "perfect" world, I would be one of those jerkwads. I have certain deeply held convictions that would utterly clash with some utopias.

The result in my case would be perfect peace because I would be bothered with silly what if type questions! Just kidding

For myself a perfect world would mean there is a difference between telling a lie and telling the truth. There would be a difference between being educated and having an education. There would be a value on a person greater than a dollar bill, medical care, great medical would be a given. The environment would be owned by all, the way it is supposed to be, and people would realize that care for it is part of making a profit from it, not a platform for which a profit is a must without any care for this environment. That people have an inherent value and that we are here to perform as best we can doing what it is that we do. We each contribute what we can and take only what is necessary. There is much to share and there is enough for everyone.

I’m definitely not laughing due to the question... I do think it is possible... for me being present in the moment, that’s perfection, it does take work... away from expectations from others and myself...often times when I look at children I see perfection ... that wild eyed wonder.. that beginners mind... that breath that feels up my chest ...

It is not. The whole of this universe, at least, shows no evidence of perfection, defies perfection. Perfection is something that man tries to attain, but usually it turns out badly . . . . the master race, for example. Even Plato's attempts to envision perfect forms runs into trouble when you try to translate those imaginary forms into the real world. The Pathagoreans had trouble from the start, when they ran into irrational numbers, like the square root of 2. You'll have to find another universe for that.