No, for years you could buy Guinness in regular 12 ounce bottle six-packs, or you could buy them in bottle six packs with the widgets or can 4-packs with the widgets.
Sometimes you would see all three at the store at the same time. The regular bottles were clear, the widget bottles were colored over and a different shape.
I don’t know where you live, but where I live, there were no guinness bottles without widgets(not counting the shortneck extra stout bottles)...until recently...then they stopped putting widgets in bottles.
I suppose I should buy some cans and taste them to test my whole premise.