Preface: Not questioning anyone's ability, and don't want to hurt anyone's feelings. I understand there's red tap, politics, etc.
Twitter's UI design and usability is lacking greatly.
Till this day, I'm confused. This button, it's to see who replied, and this button it's to view actual comments. Clicking an image on a tweet shows a different view with replies in comparison to clicking the body of the tweet. And once I finally get to see comments, it shows me 5 or so comments, with a "show more" that shows 3 more.
Content is just one long stream of white without any grouping/sections. And both sidebars are white. Truly a pain. I've noticed these problems like 5+ years ago. And these problems are not subjective, but objectively wrong. I believe some of these layoffs are correct.