"Absolutely not risky"? Do you have weather information readily available with wind direction and velocity for the next 100 miles of your trip? If rain is imminent, do you know how much and over what portion of your next leg?.
Yes, I have weather and wind available at my fingertips and so do you. So does anyone with a phone. A VERY basic origin and destination weather check usually tells you everything you need to know, but you can always add a midpoint(s) if it's a long leg with potentially variable conditions. If you review the forecast for a few hours before and after your eta you're better equipped to know what might happen if the weather report's timing is off. You don't need a degree in meteorology here, just basic common sense. And The Weather Channel app (or equivalent).
I also know how my car consumes relative to the in-car guess-o-meter, including the [fairly minimal] impact from rain. My bogey cruise speed is 80; in the event I hit unexpected conditions, I manage my reserve with range mode and/or speed. Easy peasey.
If I'm feeling really sassy I'll plug variables into EV trip planner, but usually I just budget .75-1% margin for every 5 miles planned driving. That maths out to 15-20% indicated margin for every 100 trip miles. Bear in mind I'm in a classic 60 (that tops out at 187RM), so 1% banter for me is less than other models. That .25% in there is what I use to fine tune for wind/weather/traffic, and I almost always land with 15-25RM
without having to sacrifice speed.
For more extreme weather (heavy wind, snow, extreme cold) I add margin accordingly. Knowing what I can actually do within the meat of the bell curve makes that edge case management easy.
I encourage folks unfamiliar with efficient supercharging to pay even the most basic attention to what your car is telling you. Thwarting FUD and range anxiety isn't a binary choice between extreme conservatism and graduate level mathematics.
Planning to arrive with 20 miles isn't risky, it's simply a exercise in trusting your common sense.
