I just got through that waterfall area and I certainly see what you mean, those bosses are very tanky and just unpleasant to battle against. Even with this recent patch that entire area is still in pretty bad shape. Now I'm at this winter area and even this place has a multitude of problems:
• No save crow OR campfire to heal your party before you enter the blizzard section of the map. BIG problem, especially considering the Hart gang henchmen blocking the way at the start of Area 4 used too many of my valuable items.
• The snow wolves and knife fighters covered in snow are (once again, like the other enemies in this update) too tanky in HP.
• The intermittent icy winds that deal weather damage to you on the overworld. At first it's not an issue, but later on the winds start dealing actually hard residual damage to you, making you too weak to battle against any wolves that are hard to avoid because of how you run against the wind. Would be much more tolerable if I could actually heal my team with a campfire. I don't know why but there just stopped being usable campfires after I left the waterfall area, which is a problem because at this point I don't have very many items left to keep my team alive.
• With a certain party member gone at this point in this particular story route, I don't have an AOE healer anymore.
• Let's talk about how equally tanky and tedious the mutant and group of Hart henchman are in Shiver City. Once again too much HP, they hit too hard for what the average expected level your team should be at this point, and I still don't have enough items to keep my team alive. This is honestly what I'm expecting to happen for the rest of this storyline, so whatever enemies that appear after this point should be nerfed too. I understand it's a common retort to "get good" at these games, but that shouldn't be an excuse to leave flawed game design as is.
I sincerely hope the developer sees these comments (I don't have Discord for whatever server being advertised), because these are serious problems. To be perfectly honest this update came out too soon; there should have been a lot more extensive testing with balancing out this new content better. I feel like I'm playing a late alpha build again rather than a "definitive" final release.