Sorry but soap isn't the only thing there. Dirt, organics, dyes....and on and on.Again I will say that advances don't always advance. I'll take my old timers anyday, they can do more with a few handtools than most techs can with a trailer full of tools today. Now I'm going to talk you through this slowly so pay attention. First thing that happens is the water fills up the surface porosity of the grout then someone gets in and starts bathing, the soap sits on topof the water and is rinsed off altogether when finished. If allowed to stay then the water evaporates and the soap film is effectively sucked into the grout. Same thing when working over concrete, just wet it down before you start making a mess and the clean up is a breeze. All these new products are sold to lazy a$$ homeowners that don't want to maintain things by Manufacturers who just want to sell product. They don't care as long as it lasts longer than thier warrenty. And all your advances in cement still haven't proven any longer of a lifespan than the 100 yr old stuff.
Epoxy and urethane grits were nit designed for lazy anyone. Again showing more of your ignorance. They were designed for commercial use. They needed something durable and non porous... and guess what? Cement based products didn't meet the standard.
Actually Portland based is chemically stronger than years ago. It's just a fact.
And you are so wrong about all they worry about is that it lasts longer than my warranty. My tile installations will be there long past any warranty. Most will outlast me.
Exactly how do you talk through something slowly when it's written text? You're a riot.
Also you may want to discover the "carriage return" key on your keyboard, also known as the [Enter] key. It makes reading your ramblings a bit easier.