I personally do not care about Problem 1. I mostly use Twitter in a passive way -- following people that are experts on the topics that I'm interested in. I assume if you want to get a reasonable following you need to put quite the effort in it.
Problem 2 appears but I've noticed that muting works well enough to avoid it.
Problem 3 does not seem to be Twitter-specific but again blocking and muting seems to work for me as well.
My personal take is that something brings value to you or not depending on how you use it. Here is a quote from (https://perell.com/note/the-paradox-of-abundance/) that resonates with me: "The Explore Tab on Twitter is the most important newspaper in the world. It’s littered with celebrity gossip and exaggerated political drama — both of which yield a wide reach but incentivize empty content. And yet, as the Paradox of Abundance predicts, Twitter is also one of the world’s top intellectual communities. It’s the bedrock of my social and intellectual life. It’s a place to make friends, raise your ambitions, and connect directly with people at the top of their fields. And yet, most people use Twitter to consume information with no nutritional value."