I would broadly categorizes these new tools into two categories: 1) those that are adding real value and make things easier, and 2) those that just add bling to existing tools. An example of the former category is ag, an example of the latter is duf. Also, lots of old tools can do more than you think. For example, did you know good old top can display a bar graph of CPU load for each core just like htop? Just press 1 and t after starting top. You can even make the output colored (press Z and enter), although admittedly the default color scheme is not great.
I like tools that come with nice defaults, so that I don't have to learn tricks like that. To make a somewhat bad analogy, one of the reasons that Ubuntu is so popular vs other distributions is that you have to futz with it less.
Which isn't to say that it wasn't neat to learn that top can do that, but I'm probably still going to continue using htop.
