The size, and shape of the ice you use when mixing cocktails will affect the amount of dilution added when mixing. Large cubes in a cocktail shaker have...
Ice is complicated for home use. I use my Lewis bag with glee when crushed and shattered/broken ice is called for, but I only have standard freezer cubes. I admittedly chose a seltzerator over an ice maker and vermouth fridge lol. I like the idea of tempering it - sort of like chocolate! But not really...