Well, zero-config generally means the tool is "modern", meaning it's defaults are current with the current tech/prefs of the most. Does not mean anything else. The issue here is that people tend to customize so they do not like their customization breaks because someone else have made new defaults.

Aside the real "no config", no need to read a manual etc was tempted, historically the most successful who tried it was Microsoft and we know how bad it is...

My take is that yes, we need sane defaults, but also full customization possible, a thing essentially absent in modern software.