full disclosure: I'm a micro-entrepreneur and I suspended all orders to other EU countries.
The PPWR is causing a lot of buzz, but they are missing the main point for a market place such as lectronz. PPWR is only for packaging and shipping material.
There's something similar called WEEE* for electronics. It's when you need to pay a fee at the end of the product life cycle. This is very similar to PPWR, you need to register in each member state to be able to sell electronics. The solution is also a one stop shop. But Lectronz fail to also mention this. I would argue that this is an even bigger issue than PPWR since it's already in place. Even if the PPWR is solved it's still nearly impossible to sell electronics to other EU member states.
Someone has been sleeping when these regulations were being discussed...
[*] https://environment.ec.europa.eu/topics/waste-and-recycling/...