[iktorn]

The problem with no 3 is that not every job can be measured in $$$. Especially when you are building an MVP and/or experimenting with features.

I think your approach is definitely valid for "traditional consulting" but a bit less so for more plain webdev work.

[j45]

I disagree. Every job can be measured in terms of value. Especially mutually agreeable value. These though, are business skills and not tech skills.

[iktorn]

But than you are introducing overhead of deciding this. For obvious reasons this is something that needs to be negotiated with a client and documented.