Crossing yeast purposes or uses...
Have yeasts that are used for making bread, been used for making cheese, beers/ethanol and other products, and viceversa; or do not always work well outside the 'customary/intended' application?
Are several different yeasts ever used simoultaneously combined at a variety of proportions to produce something ?
I did see a YT of this couple who were making Kefir and bread using the same strain of yeast. While later I couldn't find the same video, but I do recall it.