Why are relocation ults, regardless how much power is attached to them, allowed to be free?

This is kind of a weird trend that have recent Champions with relocation ults; teleports, blinks, and dashes, cost nothing, even if the champion has a resource bar. It seems to be counter productive since a major way to counter play someone is to try and force them to use up their resource while juking them and when they are low on said resource, use that opportunity to jump on them when they are weakest, but this is currently not entirely possible since they still have access to their most powerful ability still. Even if the relocation has a lot of damage or damage potential to attached to it, it is still free, which seems weird as Bard's ult is incredibly difficult to use and can cause more problems while dealing no damage, but still costs the normal 100 mana.

It makes me thinks that if Pantheon or Twisted Fate was released today, their ults would also be free and have a much lower cooldown.

Honestly, I feel Riot should add a reasonable cost to the free ults except in a few cases such as transformations. If Riot is adamant on keeping free ults, perhaps try the inverse instead and make all ults free.

Edit: The list of ults that are free also seem to include more recent self buff ults.