This is really has to do with a fundamental design approach adopted in the modeling and designing of sheetmetal parts.
I'm really interested in knowing about the experience and method used in designing of the parts.
I kind of liken it surface and solid modelling .
Using the sheetmetal tools really is building the part face by face like in surface modelling . Slow but has its own
benefits that the flattening can be ensured after each new sheetmetal feature is added. Also allows for some complex
corner matching etc to be performed interactively like with mitre etc.
Really it boils down to what method you really are more comfortable with and the level of parametric capability that
you ultimately want to build.
It also has to do with the confidence of being able to flatten the geometry created successfully at the end of unconventional
loop of not starting the modelling as sheetmetal.
Hope I really get a few examples and ideas and interesting methods employed by people using sheetmetal in so
many different ways .