Its up to you if you want to chase that close where such decisions become a factor. Any HP beast, bad road network, tons of traffic, or other risk factor will have me back off at least a mile from where I might otherwise be up closer. I'm not at all thinking I cannot sill get into trouble out there, but the vast majority of people who have to worry about storms taking a turn or escaping through the core are already usually too close for the situation. If its raining a ton, we all slow down on the highway to avoid hydroplaning right? Why not back off when extra hazards show up around the storm, is my thinking, to avoid the situation being on or beyond the edge of control.
Other chasers may see it differently. I love structure and lightning a lot anyway, and cannot see much of that way up close. When a tornado is happening, I can only reiterate stay out of path (possible path, including unexpected motion including turns and even reversals and loops) and you should not have to make those difficult decisions to escape. Plus you get that beautiful light if you are parallel to the hook rather than in front.
To each their own style and I wish you luck and enjoyment when you make it out to the plains.
