"You are presuming that he used modern spelling?"
Nope - I made a joke and put a smiley behind it
His audience presents us with one of the great enigmas of understanding Shakespeare - they were largely "the sweepings of the London streets", not similar in class to the readers of Dickens, yet today's equivalents would largely run a mile before sitting though 'King Lear' or reading 'Great Expectations'   
I had both educated out of me at school, where I was told on leaving that all I needed to know was how to tot up my wage packet at the end of the week
I was lucky enough to come from a family background where both were considered important and enjoyable

"MacColl was trying to achieve social change and fight against injustice."
Not entirely Dick - MacColl was a Socialist reformer, certainly, but he worked by holding up working class art as being creatively important and usin it to create his own compositions
We don't know why Shakespeare wrote how and why he did but it's a debatable point as to whether he did not challenge the status quo
I would suggest that, by presenting the Monarchy and Nobility as flawed human beings rather than the "appointed by God" superhumans they were often regarded as, he managed to challenge the status quo and keep his head on his shoulders at the same time - not a bad trick in those days