I can't say that writing and debugging are distinct for me, but the part that is more debuggish feels like it's 95% at least. Of course, writing is fun in a way that debugging almost always is not and time flies.

Debugging is not fun now. But, it can be made. And given the amount of time we spend on it, it must be made possible to be fun.

Writing 'blind', i.e. without any immediate feedback while one mentally simulates the computer - will hopefully become a thing of the past. It's ironic that writing is considered a separate activity at all.