If you are taught properly in the first place you don't need them! I remember being taught to get the aspect right. Worked okay on a 150ft width runway but needed adjustment when the runway got wider on a landaway....
More useful than TDZ markings I found were those distance to go boards counting down the runway remaining. (And for those that got it seriously wrong there were also the RHAG markers - big yellow discs in the verge.)
MB