I just went out for a few runs this morning for the first time this year. And it's hard to beat a good pair of boots. My boot fitter explained it well. You want no movement in the calf, ankle, heel, or mid-foot. In the toes you want to wiggle them. To get that kind of fit, you have to have the liner and insole heat molded to your foot. Boots that are ultra tight are great for downhill, but you pay for it the rest of the day.
My boots are absolutely tìts. HF Nordica 120's. Rear entry with 1 buckle and it takes me all of 15 seconds to put em on. Game changer if you are not racing. Racing boots are ultra tight, but you have to take them off or at least unbuckle when your not going downhill. I need a boot that works all day, not just at 45 mph.