My experience is that the algorithmic feed just wants to firehose 99.9% sensationalist trending muck I don't want from people and topics I don't want to follow or read about on twitter.
For me the absolute worst of the worst is the "More Tweets" list under certain tweets. It's basically designed to be the most sensationalist, polarizing, "hot take"ist bullshit imaginable. I'm not sure I've ever read a single thing worth reading in that section.
I think this is a difference between the desktop and web experience because I don't see any "more tweets" section. If I scroll, I just get autoloading of more replies to the tweet.
Not sure whether you’re on desktop or mobile, but I only get “More Tweets” on the mobile website if I’m not signed in. Otherwise it’s as you describe, only replies.
I have made more observations and it seems to have to do with how you arrived at the post. If I click on it from browsing my timeline, it does not show “more tweets“. If I click through to it from a link somewhere external, such as a link in an article, it does. I’m sure that somewhere there is a thorough analysis of this.
1 use case of the The More Tweets feature being useful is for following E-Sports.
I don't follow every player, coach, or organization and it's common for me to see 1 tweet from one of my follows and the More Tweets to contain content I want to consume from the 1000's of others talking about this specific scene.
I'd also recommend not using the More Tweets feature for anything too popular as it's like reading a youtube comments section.
Sorry, to be clear I'm talking about the "More Tweets" list at the bottom. What you're referring to is the "Show more replies" link which requires a click to unroll.
A rather meta example: scroll down to the "More Tweets" section under this recent Elon Musk tweet - https://twitter.com/elonmusk/status/1525738556102164480
I don't know what it might curate for each person reading this, but I'll bet you'll see what I'm talking about.