This is largely because news reporting barely existed as we understand it today. Certainly, most ordinary people heard nothing about what was happening on other continents and were primarily interested in what was happening in their own, town/county/valley/etc, which is what was reported in the handbills and broadsheets of the time. Also, remember that it took around three months to cross the Atlantic, so news from the colonies travelled extremely slowly and was naturally superceded in relevence by more local news.
There were no news agencies at the time, and the publishers of handbills and broadsheets didn't keep any archives so there are very, very few examples of news reports left to study these days. Most of what survive are cartoons which were etched onto plates for printing (and there aren't many of those left), whereas printed media was temporary set-type which was re-set for the next printing.
This is why most of the historical record is from the political perspective, because Parliamentary sessions were recorded and political letters were archived. This is how we know that the tea taxes weren't a tax hike but a redistribution of where the tax liabilities fell.
It's also how we know that colonial taxes on most goods had consistently fallen for years, despite the crippling debt that the British treasury had sustained in their defence during the Seven Years War and the growing cost of maintaining their security in the subsequent years. It's how we know that the ensuring War of Independence wasn't a particularly popular war, with many MPs actively supporting the idea of giving the American colonies independence, partly for these economic reasons and partly out of support for the concepts of liberty which had been developing in Europe for almost a century and which had more recently crossed the Atlantic.
It's a fascinating bit of history. For America, the history is defined firstly by the need of the pre-Revolutionary factions to build a narrative to win support and later by the need for a unifying national myth to cement the new nation for the decades and centuries to come.
For Britain it was just another war, and a proxy one with France at that. It doesn't really have a lot of significance in the popular history of Britain, not because it was lost but because there are so many in Britain's history. While it wasn't insignificant (at all), it was a lot smaller and had much less of an effect on the course of British history than, say, the previous Seven Years War which it won and which also doesn't figure much in Britain's popular history, despite being the war that turned Britain into the first truly global power.