Thank for your sharing.
I agree that. There’s no Weld Modifier, Merge by distance Modifier, etc .
Well. but Everything nodes is coming in 2.81. Blender becomes node based in modifiers.
Another dev suggested any future work on current modifier system is pointless because of that.
Non-destructive can not complete instead of traditional workflow, it can not do everything. Some cases have to use SubD or other techniques with other add-ons or tools.They are complement each other. But I’m not clear the boundary of Non-destructive.
As for “simple design” or " complex design", I guess non-destructive is not suitable for creating a big scenes unless apply some or all modifiers. Maybe I’m wrong. I’m a beginner 