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With a porcelain tile narrower joints are possible, both inside and out. Natural stone is always slightly inconsistent in size and wider jointing allows for this while maintaining the pattern.
If you think about it, 1.5mm variance in stone size per unit adds up to one hell of a mess if the surface is 5m wide.
ColinTheBald
@hugo7
Also, just to pick your brains, is there a practical reason for the wider grout(?) lines on external paving vs interior tiles?