@Zero13 - I am saddened to see people offer this: "My 2nd biggest gripe was the boring emotionless expressions and dialogue we had for half the chapters thanks to Frieren" as a statement.
We certainly have views in what we find compelling and interesting. One of the things that makes Frieren is how subtle her expressions and emotions are conveyed. What is made clear through the story is that she does experience emotions, but they often sneak up upon her because she is not intrinsically aware of them. She is frequently surprised by a feeling hitting her, and the characters who spend time with her reflect upon this. One of my favorite moments of this subtle art is in
https://mangadex.org/chapter/890789/29 - One of the things you'll notice is how Frieren clenches her hands when she's getting emotional. The author uses this a number of times to show when she's in distress without letting it appear on her face.
This is actually something that happens where the body begins reacting before the emotions reach a conscious level -- One thing to keep in mind, is I am not implying you are wrong for disliking Frieren or finding the story uninteresting. Just that she is not emotionless. Her emotions are subtle and expressed with a nuance of expression that may not read on first blush.
All that said: You have every right to your opinion, I hope this comment will give a little appreciation for some of the subtly in Frieren. As a fun side-game, try to find the times she clenches her hands like that. There's been a few.
- Also! Thank you for the recommendation, I'm going to give the manga you mention a try.