SoI don’t use them on most jobs, only rectified tiles, or tiles larger than 600x600 and on bowed planks. Many tilers have started using them after 10,20 30 years without them
You dont know much if its sharp sand you are using either maybe you need your clips for all tiles ,just sayingProbably outside going thru 3 ton of sharp sand with a sieve for tomorrow, and Retacking their tackety boots before bathtime with their carbloc soap and Vera on the radio singing about cliffs!