Opportunity cost.
Cloning Slack and wasting ultra-expensive engineers on that might be more expensive, and it's not your core mission.
If you have tools that allow superior efficiency shouldn't you be hiring every possible just expensive engineer you can get your hands on and put them to produce massive amounts of products to out compete everyone else in the world.
Shouldn't they be in place to replace absolutely every other tech company? That is tens of trillions of valuation in short few years.
Why do you have to waste ultra-expensive engineers on it? You have agents. And verifying your product works as it is claimed should absolutely be part of your mission. How can you possibly claim that your models are revolutionising software development if you haven't even used them to revolutionise your own software development in-house? Not only that, it would produce a huge marketing coup that would immediately lead to a flood of enterprise spending if you could demonstrate that your agents actually do what you constantly claim them to do.
PS. If you're claiming that coding an application is ultra-expensive, you are already entering the argument on the side of the comment you're arguing against, which is making a counterpoint to the article, which claims in the first sentence:
> The math is simple: if it costs almost nothing to build an app, it costs almost nothing to clone an app. And if cloning is free, subscription pricing dies.