(I don't really play atlas, so I am just noticing these stats now, looking at these changes, I know this is old news, I just assumed atlas prime was similar to other primes).
I hope atlas and similar frames get closer to their prime counterparts, I get that prime frames have more base stats, but atlas prime has almost double atlas's health which I think is WAY too much of an increase, especially on top of many other stat increases). Maybe normal atlas could be buffed to the 555 that wukong has (which is still less than atlas prime for everyone that always uses the argument "primes are supposed to be better"), so the stat increases are more in line with the other prime stat differences. It makes no sense that some prime frames have absurdly high stats compared to their non-prime variant, while others have practically none. Pick one, either make primes significantly better and make the game pay to win, or go with the minor stat increases, that min-maxers are going to pay for anyway.
I've always preferred using non-primed frames, and mostly just collecting prime frames, because everyone always defended the existence of prime access, by saying that the stat increases weren't really that relevant, so the game wasn't really pay to win (well, at least not in that way), and I would use normal frames as a way to show that you can you just use normal frames and defend the game because I don't think that prime frames should be significantly better, but these stat differences are absurd.
Also, weapons are different than frames, as they are supposed to be picked up and put down as you play the games, and most are mr locked. However no frames are mr locked anymore, and frames are more like classes in an mmo, or heroes in a hero shooter, they're not gear, so making a frames just straight up a better version of another frames is awful. Prime frames used to basically be cosmetics, that you could farm, with a little bonus, that didn't really matter, except maybe for min-maxers.
If excalibur prime had those stat increases, I would have never bought the founder pack, I would have immediately uninstalled the game because it's pay to win. I know other primes are farmable but still.
Since everyone's base stats are changing anyway, maybe use this as an opportunity to look at the base stats of some frames, although I know armor was looked at a while ago, there's no good reason that atlas prime should have that much of an increase over atlas. Some older frames including their prime variants might be able to use some minor adjustments to their stats as well, especially energy.
If these don't change now though, I hope atlas will get a rework/revisit soon where this happens, and to be honest I think a ton of frames could use mini-reworks, to keep up with how warframe has changed over time.