Except that most people then fail to calculate their groundspeed properly from MDR - and cannot then work out the time at fixes accordingly.
MDR is excellent for unplanned diversions. But it is emphatically not an acceptable substitute for proper pre-flight planning. Whether you use a Dalton, an electronic calculator or an on-line method is immaterial. But the flight does require proper planning.
Incidentally, putting the groundpseed against the '60', then reading off time at waypoint distances along a leg is a classic example of the advantage of analogue versus digital computation in some circumstances.
Now waggle your ears and do some bunnyhops!