Not to mention the fact that the feed itself wasn't part of Facebook's original proposition but was a controversial change introduced despite user protests, and the content of the feed today doesn't remotely resemble the content of the feed in 2006 which doesn't remotely resemble the content of the feed in 2009 or 2015

If McDonalds had been a pizza joint within the memories of much of its user base before introducing a Big Mac which was chicken one year and beef the next with constant tweaks to the sauces and vegetable content, I'm not sure the introduction of tacos would be that controversial.