I think the X and I will both be shopped as “utility” vehicles despite their size differences. Car shopping isn’t a totally rational process for most customers and if one is looking for a crossover the Model 3 simply wont be on the list to consider.
The comparison also dramatically highlights how grossly inefficient the I-Pace seems to be. The Model X is huge, heavy, powerful, can seat seven and tow a real boat. Somehow the compact Jag uses way more fuel.
I came to the X from a Chevrolet Volt. The X is around 15% larger in every direction, and about 30% heavier - and has the same EPA efficiency rating.
If GM had built a small SUV like the iPace with first generation Volt technology, I suspect the efficiency would fall about where the iPace does. Tesla is just doing better.