As long as the UN’s WIPO was allowed to take over this convention, then that is not a good thing, because they will subvert it. The origin is less important than the destination, once the UN was allowed to get its hooks into it (which it did in 1967).
By that you mean someone in country A cannot force country B to register their trademark? Over earlier national trademark rights? Expound please. (I would agree that it's absolutely disgusting that Budweiser USA has trademark rights for horsepi$$ over one of the finest beers brewed on earth - but that is not the norm. If you have a draft for the perfect global IP system, kindly share.)