I know there are rumors about how B scenarios weren't originally planned and were perhaps scrapped together towards the end of development, but it's still really disappointing how they are almost identical. What's even more disappointing is how some scenes are exclusive to the A scenarios, so playing through both doesn't actually show you everything. You effectively have to play through the game 4 times to see all the cutscenes. You could say this is faithful to the original in that way, but it's definitely a case where they could have surpassed the original in design, by having the B campaign be completely unique, albiet shorter and sweeter.
Then there is the weird handgun issue, which both B scenarios have. They introduce a new ammo types for new handguns that, while seemingly have slightly higher damage output, aren't much different and on top of that, gunpowder does not make the new ammo type. So while you technically can use gunpowder to craft more handgun ammo, it will be ammo for the old 9mm, which is worse than the new one(s). It creates this weird scenario where you never want to use gunpowder to craft one of the three different combinations, and you have to rely solely on .45AE pick-ups, which you cannot craft.
The other problem is continuity. Why do you fight all the same bosses? Scenario A happens first in the timeline, and you killed them all the first time through. Why are all the puzzles reset? Why are all the doors locked? It's like scenario A never actually happened. They could've really had something here, where what you do in scenario A directly effects scenario B. Maybe you pick up some ammo or board a window, and in scenario B the ammo isn't there anymore, and zombies can't get through the boarded window. Maybe something breaks and now isn't usable for the second character, so you have to figure out a whole new way to solve a problem.
I just find the whole thing really disappointing. I was coming off of my first playthrough hot, having never played the original RE2 and absolutely loving this remake to death. Only to be soured by my slow realization that the B scenario is not actually new content, just remixed content of all the things I just did. Again, I know there is a good chance a B scenario wasn't even originally planned, and maybe it was something cobbled together last minute, but it really makes me wonder what could have been.