[bigiain]

Back when I did a lot of WP sites, the WordFence plugin pretty much did exactly this...

Looks like it's still available and recently updated: https://wordpress.org/plugins/wordfence/

[Vanderson]

At a glance this looks neat. But don't you think it's odd that WP doesn't have built in security of a similar nature?

[lowercased]

no, because it takes time/effort to keep all that up to date. if wp.com provided it for a fee for wp.com-hosted sites, i'd understand that.