Wooo! This was delightful. I think the blind playthrough worked out pretty well, all things considered. I can also tell, that I would probably not prefer it for most of the "regular" adventures (though I wouldn't HATE it). The reason being that since these are walkthroughs, watching someone figure stuff out for the first time, possibly making mistakes, kind of works against the "let me show you how it's done" informative aspect that the more complex adventures require.
But for this, where it's basically an interactive movie, it worked great. In Part 1, I can tell I got you overly paranoid about bugs, and as you eventually saw, they're not user-caused but seemingly random glitches. For my part I got the one where Yarpen magically leaves the room when the fistfight starts, leaving Geralt stuck in fistfight mode and stuck in the room since you can't use the door. On reloading I got the "no one has anything to say, ever again" bug. I kept meditating at the fire, advancing an hour at a time, thinking there might be new responses based on time of day. You probably noticed that the NPC's had routines they followed, and those changed up as the "plot" progressed. Adda will actually change back and forth from human to striga based on time of day.
Speaking of which, I noticed a very memorable scene was missing. This scene involved that little side area in Room #2 where there is like a smoking circle with hookahs and cushions. At one point the crazy dwarf (same one who made the Snot of Truth or whatever) gets Geralt to smoke some "leaf" and he has this hallucination where a bunch of girls are dancing around him making fun of him.
So I wonder, did you cut that scene out or did you never encounter it? I also remember multiple conversations with Siegfried and I think there's a point where Geralt actually tries the Snot of Power and gets so drunk he does his "intoxicated" stagger and you have to meditate to get rid of it. So I guess maybe every single conversation isn't necessary to complete the adventure.