You've written the true thing. It's direct, maybe a little sharp, and you know it needs softening before it goes. So you start editing, and somewhere in the fifth draft you notice the message has stopped saying anything. The point dissolved along with the edge. What started as "I can't keep covering for you on this" is now "just wanted to check in on how things are going, no worries either way!" You've softened it into nothing.
This is the trap almost everyone falls into when told to be kinder in a hard message: they treat kindness and clarity as opposites, so softening becomes a process of subtraction, cutting the parts that might sting until what's left can't sting anyone, because it can't do anything. A message edited for maximum comfort at the cost of its actual content isn't kind. It's just quieter, and quiet messages about real problems don't solve them, they just delay the version that finally does, usually once you're too frustrated to be gentle at all.
Real softening doesn't remove the point. It removes the parts that were never the point to begin with, the character judgment riding along with the request, the sharp edge that exists to wound rather than inform. Here's the distinction in practice.
Keep the request, cut the verdict. "You need to stop being so unreliable" makes a claim about who someone is. "I need the reports by Friday so I can plan around them" makes a claim about what you need. Same underlying frustration, only one of them attacks.
Keep the specific, cut the sweeping. "You always do this" is unfalsifiable and it invites a defense of the whole pattern. "This is the third week the file's been late" is a fact they can't argue with, because it's just true, and it doesn't ask them to defend their entire character to answer it.
Add one clause of context, not three paragraphs of cushioning. "I know things have been hectic, and I still need this by Friday" acknowledges their situation without drowning the ask in so much preamble that the ask itself gets lost.
Compare the drafts:
Too sharp: "You never get back to me on time and it's honestly kind of disrespectful at this point."
Oversoftened: "Hey! No pressure at all, just wondering if maybe you had a chance to look at that thing, totally fine if not, just curious!"
Actually softened: "I've noticed replies have been slower lately and it's made planning harder on my end. Could we aim for within a day or two going forward?"
The third version keeps every ounce of the point. It just delivers it without the insult riding shotgun. That's the whole craft: strip the attack, keep the ask. If you find yourself deleting the ask itself to make a message feel gentler, you haven't softened it. You've abandoned it, and the problem it was trying to name is still sitting there, waiting for a version of you with less patience left to say it badly.