Since you're so incapable of thinking for yourself I'll go through it again with everything you mentioned. Same prerequisite except now everyone has a phone and excess phones turn instantly to waste, or do you need a point by point explanation on how excess supply turns into waste?

Scenario 1: Every year 1000 new phones get released.

• Y1: 500 people buy new phones and sell their old phones. 500 people buy used phones and throw away 500 phones because nobody wants to buy the previous phone. 500 phones just go to waste. End of the year e-waste is 1000 phones
• Y2: Same thing. End of year waste is 2000 phones.
• Y3: Same thing. End of year waste is 3000 phones.
• ...
• Y10: Still the same thing. End of year waste is 10k phones.

Scenario 2: Every 3 years 1000 new phones get released.

• Y1: 500 people buy new phones and sell their old phones. 500 people buy used phones and throw away 500 phones because nobody wants to buy the previous phone. 500 new phones go to waste. End of the year e-waste is 1000 phones
• Y2: People keep using the phones they have. End of the year e-waste is 1000 phones
• Y3: People keep using the phones they have. End of the year e-waste is 1000 phones
• Y5: New phone comes out. 500 people and sell their old phones. 500 people buy used phones and throw away 500 phones because nobody wants to buy the previous phone. 500 new phones go to waste. End of the year e-waste is 2000 old phones
• Y6: People keep using the phones they have. End of the year e-waste is 2000 phones
• Y7: People keep using the phones they have. End of the year e-waste is 2000 phones
• Y8: New phone comes out. 500 people and sell their old phones. 500 people buy used phones and throw away 500 phones because nobody wants to buy the previous phone. 500 new phones go to waste. End of the year e-waste is 3000 old phones
• Y0: People keep using the phones they have. End of the year e-waste is 3000 phones
• Y10: People keep using the phones they have. End of the year e-waste is 3000 phones

As you can see. Even with supply meets the demand exactly you generate waste if you release a new phone every year. If the supply exceeds the demand it generated waste. I don't see how it could be made any clearer beyond also going over your comment point by point.

Why would you make your scenario supply constrained?

Because how do you create a secondary market that would buy used phones? I could've gone with "people are poor" but that is much harder to put into an example. The supply constraint itself doesn't matter, but I did my best with the new example.

Your argument is simply if we sold less phones, less would go to e-waste, and duh.

Nope. My argument was that if we made less phones less would go to e-waste. That also covers unsold phones that go straight into waste as evident from my new example.

That wasn’t debate, it was whether releasing new phones every year was wasteful vs new phones being released every 2-3 years.

If you release a new phone every year you manufacture more phones. I guess technically you can manufacture the same amount of the same model for 2-3 years as you would manufacture yearly new phone. But that makes no sense from an enterprising point of view because you reach market saturation and the phones simply don't get sold, you're just manufacturing a loss for the company. Even if you manufacture the same model yearly you're still going to manufacture them less (due to demand dropping) than if you made a new model every year.

Your scenario also assuming people buy used or they just don’t have a phone. People who buy a used phone generally do so instead of buying a new phone.

If you paid attention you would've noticed that in both previous scenarios 800-900 people bought used phones and only 100-200 people bought brand new phones. I did that deliberately because you argued that reselling the phone has an effect when it really doesn't. At the end of the line the person who bought the last used phone throws their current phone away because you can't sell that to anyone. Which means as long as phone is manufactured regardless of whether it gets sold or not or resold or not, eventually it will go in the bin as e-waste. The best way to reduce waste is to not produce excessively like we're doing right now.