If you want to convince me that NG does not have strong, general purpose bronze cards (other than the blightmaker/assassin combo), please give me examples of bronzes you consider generally strong. Simply making a general claim with no supporting evidence isn’t helpful.
I'm going to assume you miswrote here, because I'm saying NG DOES have strong bronzes, not that it does not. AND that they have weak bronzes as well, like all other factions. As for the examples, they were given earlier by the other person and I added VWM myself to the list. Your argument that they require specific deck-building and prone to removal apply to most of the bronzes across the board and certainly not unique to NG. In the case of the sergeant, for example, yes, it comes down as 4 and is easy to remove, but as a ST player I can site the swordsman and the commando as the 4p cards that are very similar, except they can only engine out 1 point per turn, while the sergeant can laugh and get 3. Assimilate cards can proc twice a turn, while Harmony cards cannot without a leader. The viper adept drops at 5. The aristocrats can get 10 point slam on deploy AND it's an engine. The locks that were already mentioned aren't going to do much against point slam, obviously, though whether pointslam is truly prevalent is very debatable, and the fact that they can easily stop engine decks DOES still make them good. Cheap poison cards are still good. Some of the soldiers are good within the archtype now that it's been buffed with armor. There are bunch of cards that serve very good purpose for their respective clog and mill decks. Those are terrible, asinine archetypes, but the cards are still there to facilitate that gameplay, should you desire it. Their thinning cards are good even without the blightmaker. The dogs and the impera brigade are certainly better than ST's volunteer and sentinel set. Also, the diviner is the best bronze purify in the game that happens to also be an engine somehow.
In short, once again, there is no real, tangible gap in quality between NG bronze units and that of other factions. A lot of the cards are similar across the board, and a lot of them on NG side are actually better than others. Meanwhile, we're also told that NG is a "control faction," so it's OK for them to have all those insane golds.