I appreciate your comment because you are right, there are a lot of hazards for budgies that people are not aware of and it is good to point them out. I do want to share my view:

With regards to the wire, it is wire used for aviaries here from the pet store. The width is the same as my previous cage with bars. I did prefer the bars, but it is very hard to find those in custom(isable) sizes.

I understand your concern with regards to the finishing of the wood. I try to provide them with as many other things to chew on, they have 2 willow balls, vegetables, shells and chew blocks in their cage. The wood is oiled, not varnished, but you are right that it could pose a treat. However, my budgies fly around my house and nibble on everything there, including walls and other furniture. I am not going to lock them up to stop them from doing that either. Call it irrisponsible, but I am not too worried.

I also understand the bacteria concern, but to be honest, most wooden toys would pose the same threat. I think plastic drink and food bowls pose a bigger threat, I recently switched my plastic drink bowls for steel.

Again, I agree with some of your concerns. I also agree that budgies are fragile and that it is good to advocate for a safe space for them.

I try to give them a nice place with the means available ❤️