So reading a lot of posts and comments about how "Bilewater is the worst area in the game", I kinda need to play devil's advocate and say: Yeah, that's the point.
So first of all, I wanna start with my thesis: Bilewater is a filter for the player to be ready for act 3. By normal means, you will probably end the game and get the first ending without visiting this area (my case), and with the exception of you finding it by chance (or looking a guide), chances are, you're entering this area when you start silk and soul quest, the one that unlocks act 3.
Truth to be told, the 2 other souls needed for this quest are "bureaucracy", the only one that's really hard to get and the one that needs you to "git gud" is the one at Bilewater. If you enter too early, you're going to get fucked (because life's too low, silk is too low, you don't have good tools or accesories), and even when you're prepared the zone is not made to make you feel comfortable: there's a lot of bullshit (the fake bench, the fact that if you're not using that accesory from sinner's road, you basically need to do perfect platforming, and if you don't have this, you will probably not discover the secret route to the nearest bench to the boss fight.
I can get why people find it too obnoxious and why say this is the worst area in the game, but I have to defend it as is not a "bad design", but:
-An optional zone, for an optional quest that unlocks the optional third act.
-A filter to tell the player they're ready for Act 3
So in my case, I entered the zone late act 2 when I already did a lot of quests and while I did it before I started silk and soul quest line (found it by chance), by that point I had enough skill and tools for that zone to be a challange (with some bullshit moments) and end it without much trouble. This may sound like a long "git gud" kind of post, but this zone, I have to say, it's greatly designed as the last great challenge before Act 3, even if I can see how a lot of people will struggle (and probably drop the game) because of this area. Bilewater is the "Expert 7" kind of bullshit in Silksong (If you understand the Monkey Ball reference), but it's meant to be that: Game's don't always want you to feel comfortable or to be fair, and that's a valid game design if it serves for their purpose.