That is intentional. At some point the sense grew that abusers liked the attention they were getting through the page. So their antics mostly stopped being recorded there. In princple only a small group of editors (the arbitration committee, and the checkusers, totalling a few dozen people) are allowed to maintain and share info about wikipedia stuff with each other confidentially. If you have some issue that you don't want to discuss in public, you are supposed to email it to one of those groups. So I suspect that a fair amount of LTA tracking happens on the arbcom wiki (yes they have a special one) or on the checkuser mailing list.
In practice I suspect a lot of regular wiki admins do similar on the quiet.
