Ceramic tile seam beauty must caulking render? （ From two aspects to consider)

Ceramic tile seam beauty must caulking render?

this question should be considered from two aspects: the cost and quality. Used caulking agent rendering generally need to have 3 mm gap, gap filling agent cost is low, have seam caulking agent render whole beautiful natural cost reduction, but also reduce service life, if only beautiful seam an agent beautiful seam an agent, the cost is higher, but the service life is longer, the owner saw the root with the specific circumstances decide need caulking to render.