With a granite backsplash, you'll still have a seam so it defeats the purpose stated by that granite guy. Only time I see tile over a 3" granite backsplash is when they are done at different times (change in homeowners or you decide to add tile in the future). Most people getting new counters will just tile from the counter up.

It is OK, if it is what you want to do. It is just a matter of taste. Some people think that the 4" granite splash with tile on top is dated, but it is also determined by area/region. Where I live it is very normal, and I am abnormal for not doing one, but I am also abnormal because I am doing a more modern kitchen. This is an image from Houzz that shows Giallo Ornamental countertop with mosaic tile backsplash to the counter(If you click on any of the images they should go to the Houzz site and you will see them bigger): [Traditional Kitchen design[(https://www.houzz.com/photos/traditional-kitchen-ideas-phbr1-bp~t_709~s_2107) by Toronto Interior Designer Jennifer Brouwer (Jennifer Brouwer Design) These Houzz images show a 4" splash with mosaic above: [Traditional Kitchen design[(https://www.houzz.com/photos/traditional-kitchen-ideas-phbr1-bp~t_709~s_2107) by Dc Metro Design-build Synergy Design & Construction, Inc. [Traditional Kitchen design[(https://www.houzz.com/photos/traditional-kitchen-ideas-phbr1-bp~t_709~s_2107) by Newark Kitchen And Bath Tim Kriebel - KRIEBELDESIGN This is just the low splash: [Contemporary Kitchen design[(https://www.houzz.com/photos/contemporary-kitchen-ideas-phbr1-bp~t_709~s_2103) by Atlanta Kitchen And Bath Teri Turan Which look do you like?

I think there’d be too many patterns competing for attention. If your heart is set on lantern tile there are some very beautiful ones that have a smooth surface and would look quite nice in your kitchen. Using a grout colour matched to the colour of the tile would further minimize the busy-ness that a lantern tile can create.

Context is key. What other colors are in the kitchen, house style, flooring type, appliance type and finish. All that being said wait until the tops are installed if at all possible.