Shameless self quote.
Yes it does, Ferrothorn has the niche if it's typing and utility, do you know that nowadays people actually speed creep their ferrothorn to beat mega Sableye with two power whips? No, you never thought about that did you?
Clefable is a perfect storm of movepool and two anti metagame abilities couple with thunder wave, it wouldn't defeat its targets without those 3 factors, it's defense is mediocre to a point it is 2hkoed cleanly by most wallbreakers,sadly most folks don't run wallbreakers anymore.
Blissey is **** outside of Ubers, Chansey isn't due to how damage is calculated, it has to give up passive recovery and is a complete momentum killer and its low speed works against it without thunder wave.
A good speed Stat determines what wallbreakers can't defeat you and how good you are at switching in. This is competitive dude, gen 6 is not about typing or **** terminology like type cores or tanks, it's all about role compression.