I removed the center focusing aid screens from my Nikon F bodies from day-1 to have a flat matte screen to focus anywhere without being "distracted" by (or attracted TO) the center....
...and l learned to focus anywhere on the screen...that has helped me a lot with the modern AF focusing screens on dSLRs that are much "finer" than the coarse screens of MF cameras ... though VERY CAREFUL/CRITICAL focusing with the nearly invisible microprism on AF screens is possible, but it requires a lot of concentration....I also don't look at the focus confirm LED...too distracting...