[mhomde]

Unfortunately IMO that kind of thinking seldom works. It's very managerial to assign specific time and percentages to things but in practice I've never known development to be managed that way. Also you underestimate their weaselness :)

Refactoring needs to be an integral and constant part of the development, in the long run that will decrease time needed for refactoring, and time required to fix bugs. But that time is variable, and might come in large chunks depending on how much technical debt you've accumulated

[crdoconnor]

Precision isn't the issue. Story pointing isn't supposed to be 100% accurate either. It's supposed to shine a light on an otherwise opaque process. It works at that. This is the same.

I could quite easily spend all of my time refactoring and none on features and vice versa. There is no "right" amount as you seem to think, just a whole bunch of trade offs.

I think you underestimate the power of making something measurable and exposing it to upper management. That often changes behaviour in a quite radical way, especially among weasels.

And, you've never known development to be managed in this way because it's a new idea.