Its also pretty easy to get it setup to a semi-customized basic look and feel. Use one of the bigger themes, a popular Icon pack and a nice matching wallpaper as well as a little task bar customization and some widgets and youre set, and all this takes less than two hours.
But is it really a Problem exclusive to the fediverse? there is several large news communities on reddit as well, and you have to pick or see duplicates. Also, this is only an issue in heavily aggregation-focused communities, not in those where content is generated (memes, hobby communities) as those do not have the issue of duplicates so you can just sub to all the ones you are interested in, even if several of them have the same subject.