Why is ciabatta poolish usually made with instant yeast?

So far all the "classic" ciabatta recipes I have found propose using small amounts of instant yeast.
But I'm pretty sure that ciabatta predates invention of instant yeast so why not use sourdough instead?
It work pretty well for me except the poolish doesn't get bubbly overnight in the fridge (6 degree Celsius) but if I keep it for like 3 days it looks like gluten gets over-fermented. On the other hand, if I add more sourdough to the poolish it probably will get too contaminated with over fermented whole wheat and rye (I use it to feed my sourdough). So is it the reason?
Best Answer
Commercially produced yeast has been around since the mid-late 1800s, and the commercial strains we use today have been around since the 40s while Ciabatta was invented in 1982. So while ciabatta seems like it's a very old traditional thing it is relatively new, and commercial yeast was widely available.
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How much instant yeast is needed for poolish?
But this article focuses on the other four: poolish, biga, p\xe2te ferment\xe9e (also called simply pre-fermented dough), and sponge....Whole Wheat Pita.1Poolish:1/4teaspoon (1 g) active dry yeast1cup (8.00 fl. ounces) room-temperature water1Pita Dough:6cups (25.50 ounces) bread flour6 more rows•Jun 10, 2016How do you make poolish for ciabatta bread?
POOLISH: The night before making the ciabatta, make the Poolish by simply mixing 300 grams Bread flour with 300 grams water, and 1/8 tsp yeast. Be sure to incorporate all ingredients thoroughly, as there should be no dry flour present. Place the Poolish into a food safe container with a lid.Is active dry yeast the same as instant yeast?
Dry yeast comes in two forms: active and instant. "Active" describes any dry yeast that needs to be activated prior to use, while "instant dry yeast" describes any dry yeast that's ready for use the instant you open the package.What is the difference between poolish and old dough?
The main difference between a Poolish and a Levain is in the composition of fermentative microbes in the culture. Commercial yeast is added to the Poolish to leaven bread, while the levain does not contain any commercial yeast. The levain relies on wild yeast and acid producing bacteria for its leavening abilities.How to Make Ciabatta Bread (Yeast-Leavened, Poolish Method)
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