I love this thread - at the heart of it is that we are imagining something different when we hear the word 'roast'!
For me a roast dinner is any main meal where the main protein is a piece of roasted meat (and I will stretch that to a whole chicken grilled on the BBQ as the meat result is pretty much the same)
For me it comes with 2-3 veg (can be simpleroasted veg, or steamed veg) and a starch - usually potatoes either simple roasts or mash, but boiled new potatoes in Spring meet the cut. And occasionally if out of potatoes rice works for us too.
We rarely eat beef but if we did I might do Yorkshires as a special treat.
(we usually have a salad with every meal here but that's just to get extra veg in us and not what I think of as a core component of the roast)
I don't think of my weekly roast meals as the same as the BIG roast dinners of Christmas / New Year / Easter etc - where I do the proper, faffy roast potatoes, fancy roasted veg like honeyed parsnips, or roast brussels with bacon and chesnuts etc, little sausages wrapped in bacon. Now those meals take a while to prep for, and clean up after.
Simple roasts for every week do not take long at all and use hardly any pans.