T
Time's Ran Out
I would go with the customer on this one!
As I can see the joins and straight lines in various areas I'd at least try to blend a grout line into the wider 'gap' areas!
I wouldn't advocate grouting the whole lot but I certainly wouldn't leave it so obvious that they are sheets or pieces.
Test an area of similar colour grout to the background on an unobtrusive area and see how easy it comes off before sealing again.
As I can see the joins and straight lines in various areas I'd at least try to blend a grout line into the wider 'gap' areas!
I wouldn't advocate grouting the whole lot but I certainly wouldn't leave it so obvious that they are sheets or pieces.
Test an area of similar colour grout to the background on an unobtrusive area and see how easy it comes off before sealing again.