Hauling stuff doesn't need width as much as length.
Depends on what you are in the habit of hauling. The longest thing I have to accommodate front-to-back is a golf bag a little less than 50". And in any case it fits side to side at the back of a CX-5 where there a bump outs.
If you were in the habit of hauling 4' x 8' sheets of plywood or the like you'd need a minivan or a 3-row SUV. That capability to lay those sheets flat used to be touted by makers when the vehicle fit the bill until they realized that's a low priority for a preponderance of buyers. They are more likely now to tout creature comforts in the second row.
In picking something like a CX-70, length would matter if you have something to haul regularly that is longer than a golf bag and less than an 8' piece of lumber. That's a pretty narrow niche between a CX-5-sized vehicle and a 3-row SUV (surfboard, skis?).
In this comparison, for most folks, total usable
cargo capacity is what matters. You can't compare vehicles based on the manufacturer's specs. First, there is no industry standard for measuring cargo capacity. Second, it would be imprudent to load it to the gills and block the rear window especially on a road trip when that is most likely to be the circumstance.
If you're not in the habit of hauling longer items my advice would be to get a tape measure and calculate cubic feet of the usable space on a current vehicle as a benchmark--length x width x usable height where you can still get a view out the back. Estimate how much more you might need. Then do the same with a prospective vehicle to see if it fits the bill.
For example, I know that my Sienna with the second row tumbled forward (not removed) is just about right for two month jaunts to Florida. When I go to trade, I will consider 3-row SUVs where the second row folds flat. Measurements will be made on the Sienna and the prospect. In glancing at a Highlander, the length looks comparable with second row fold-flats vs. Sienna tumble forwards but the usable height is noticeably less. The proof is the "putting", putting a tape on these things.