The effect discussed here averages itself out over the course of one year.

Leap years and leap seconds are required due to other effects that don't (leap years because of the non-integer ratio between year length and day length and leap seconds because the length of day is increasing slowly)

Well you do sorta have to deal with it; leap seconds aren't fun, and are actually quite stupid. Time's already complicated enough without adhering to a few folks that care about "solar" time. Either kill them off, or move to leap hours (which puts the next jump so far out, no one will care).