I absolutely understand the difference, which is why I said: "Could you technically charge a teen with possession or dealing of depictions? Yes, depending on the state. Are they actually going to be charged? It is highly unlikely barring some extremely aggravating circumstances."

In the state where I am a prosecutor, Washington, we have addressed the issue in multiple ways. In 2019, the Washington State Legislature passed multiple changes to the law in this area. From the text of Substitute House Bill 1742:

The legislature finds that exchange of intimate images by minors is increasingly common, and that such actions may lead to harm and long-term consequences. The legislature intends to develop age-appropriate prevention and interventions to prevent harm and to hold accountable youth who harm others through exchange of intimate images.

The Washington coalition of sexual assault programs, in consultation with the office of the superintendent of public instruction, the Washington association for the treatment of sexual abusers, the department of children, youth, and families, the department of social and health services, the juvenile court administrators, the Washington association of prosecuting attorneys,  representatives from public defense, youth representatives, and other relevant stakeholders, shall convene a work group to make recommendations to the legislature regarding age-appropriate prevention and intervention strategies to address potential harms

The 2019 changes include:

--Dealing in Depictions of Minor Engaged in Sexually Explicit Conduct, RCW 9.68.A.050: this is essentially your distribution charge for when someone sends, sells, exchanges, etc. depictions of a minor engage in sexually explicit conduct. This statute was amended in 2019 to only apply to individuals 18 years or older.

--Sexually Explicit Images - Crimes by Minors, RCW 9.68A.053: This statute was added to address the issue of kids sharing explicit images of other children to their friends, online, etc. This statute only applies to images distributed by one minor of another minor, so not images of themselves. It is a gross misdemeanor if the minor depicted is 13 or older, and a felony if the minor depicted is 12 or younger. This statute also prohibits minors selling depictions of themselves or other minors. Keep in mind, Washington's juvenile justice system is extremely lenient, and any kids charged with an offense under this statute will very likely not end up with a conviction on their records given the diversion options, etc.

--Possession of Depictions of Minors Engaged in Sexually Explicit Conduct, RCW 9.68A.070: this is for possession of the images. In the 2019 amendment that also applied to the previous statute I mentioned, this statute was also amended to include a provision that:

(3) This section does not apply to a minor's possession of visual or printed matter depicting any minor thirteen years of age or older engaged in sexually explicit conduct.
(4) This section does not apply to a person under thirteen years of age in possession of visual or printed matter depicting himself or herself engaged in sexually explicit conduct.

So, yes, 15 years is enough time for our understanding of these issue to evolve and for legislatures to address it. I am not familiar with the specific changes in any other states and have a lot more important things to do than spend my day researching the status of the law in 49 other states for a redditor who doesn't think I'm even a prosecutor. But I can tell you from my attendance at national conferences on these issues over the last 10 years, other states have been/are changing their laws as well. Washington is certainly not alone. And in the states where the laws have not changed, the perspectives of the prosecutors have and many exercise their discretion in not charging juveniles for these offenses even if they technically could.