Dead Man's Plate, why can't i outrun their meat wall anymore?

So i have been playing a few games and keep running into people using , and i keep running into the same issue. That being they are basically impossible to out run. Now i don't have issue with most of the stat line for this item, 500 HP is good; 50 armor is nice; the slow is also totally understandable. But WHY does this item need to give so much bonus movement speed? I usually see this thing giving 30-60 bonus movement speed, or approximately 10-20% bonus movement speed. Other items will usually top out at about 5-7% bonus movement speed, so why does this one item give such insanely high bonus movement speed? As it stands the only "counters" i've been able to find to this bad boy is either playing a champion who can dash over walls thus negating the enemy the chance to catch me, or to buy an item like or so i can keep slowing them and thus putting off their ability to build additional movement speed.