Depends what you mean by 'doesn't matter'. For the consumer looking to make sense of what device they want, it matters. There's a reason a lot of companies don't pump out a new iteration of their products every few weeks. I don't think anybody is saying they 'must not be allowed' to do this, but rather that it's confusing they choose to do so.
It doesn't matter to them since they don't care about the cost, and the form factor will push people to buy new models anyway.
Take the RG35XX SP model. Its only advantage against the previous RG35XX models is the GBA SP form factor, but they know for a fact that it'll sell because of that appearance and the nostalgia involved with the GBA SP.
Take this model. Its only advantage against the other high-end models is the square-shaped screen, but they know for a fact that it'll sell because competitors already managed to sell other square-shaped screens, despite the fact theirs were low-end models and Anbernic's model is more a high-end model, specs-wise.
The appearance of the model is the reason it sells anyway.
How is 'China doesn't care' a good rebuttal to the issue of e-waste? I think you'll find that's the very source of the problem, not it's antidote.
It is the source of the problem AND the reason it won't change a thing.
China only cares about making products and selling them. Therefore, their companies are aiming for that, and not caring about any environmental issues caused by their attitude. Think 1800s USA and Europe, where high productivity was the main target.
And while the problem lies in the fact other countries still buy their products, it isn't realistically something you can actively fight against, considering it means fighting your own country as well as most of the biggest countries of the world, for a chance of blocking companies like Anbernic that massively produce plastic e-waste.
Sure, you can fight them at your own level, but you won't produce anything realistic by complaining on forums and discussion channels.
GBAt did this to you, not us criticizers. By giving espace to every new device, they've conditioned the readers not to care about any of them. And to disregard Anbernic as ewaste.
I do personally care. But I also know GBAt is too small to have any impact on the massive production scale that the three big e-waste producers (China, India and USA) do to the world, and by extension, I know that complaining here does not, for a fact, have any real impact on their production. And while your battles have a sound logic and a valid cause behind them, the level you're fighting in is futile and has no meaning.
Try coming back with much bigger numbers (because seeing the same 2-3 people complaining has no big enough weight to matter) and acting at a more important level (because GBAtemp is small compared to much bigger and more active companies e-waste-wise) before starting to complain, because as I said, what you do now amounts to pissing on a violin - It doesn't do anything but a weird sound that'll be forgotten in one or two hours.