Why doesn't all heals have a baseline of cleansing a condition?

[Vilin.8056]

Some classes posses condition transfer capabilities as their offensive skill set, therefore they do need the choice.

[Turkeyspit.3965]

If every heal was given a condi cleanse, ANET would have to then cull some of the condi cleanse currently baked in to other traits, skills and utilities. This will eventually lead us to a place where for some builds, in order to cleanse, you would need to burn your heal at the same time. Maybe not a big issue if you're covered in stacks of burning, but not an ideal circumstance if what you're trying to lose are stacks of chilled, cripple or weakness.