Deeply disappointed, this is yet another instance of top down decisions. WP now feels more and more like a corporation than an open foundation. Even corporations try to listen to their base and users.
Those charts provide no personally identifiable information so there is no need to remove them.

From a user’s perspective, I use those charts when comparing between plugins to know which one is growing and more likely to survive on the mid to long term, and thus which one I should use.

And from a devloper’s perspective, those charts help deciding which plugins to develop add-ons for.