Yes, I believe you are correct. There is a lot of rhyolitic magma on the surface and that would indicate a rather explosive history and potential for Yellowstone. We know that past eruptions in Yellowstone have been catastrophic certainly. My point was only that different possibilities exist for future eruptions.
Yes—likely to be explosive but possibly with quite a few minor vents over quite a few miles. Still, the damage of most concern would be to crops, water supplies and to people’s lungs.
Here’s the probable deal from what I’ve read over the years. Crops would be wiped out for decades for about 500 miles or so to the east of the eruption. Downwind surface water supplies for several hundred miles might be very toxic for a short time—very bad.
Further to the south, north, and well beyond 500 miles (2-inch or so ash cover, less of it further away), arable land (included ranchland) would need to be plowed and planted (tough to do in dry ranchland and not many willing to do that much work these days). Those areas with less ash cover would recover and do even better after about 2-4 years. The initially toxic ash, given time and buried further into the soil, helps to better fertilize plants.
For people, some windows would need to be covered with filters and fans (large, slow fans being best). Particle masks or other facial coverings would be needed outdoors. People have survived in recent years downwind from eruptions and close to them. Do people prepare in such ways for such a large eruption? Nearly no one does...maybe a few, who already do so with window filters in wildfire areas (smoke).
But yeah, within a few hundred miles, the cold ash would be a killer. The chances, though, of Yellowstone going off within any designated ten-year period are extremely slim. The chances of a tornado hitting a pre-designated, 100-year-old house in the Midwest are probably much greater.
There would also be the change in worldwide climate—much colder and drier for several years (probably about 3 or so before warming very noticeably). That would have a terrible influence on crops.
So yes. It would be quite catastrophic but not in ways most often described in articles and discussions. The chances of Yellowstone blowing anytime soon—virtually infinitesimally low.