This statement is kinda overgeneralizing the capabilities of an x drive tbh. it depends on the wheel angle, wheel radius, internal motor gearing, external gearing, any other contributor to MA, and which directions we’re considering given those previous data points. There’s lots of ways to make an x drive have a higher MA than a tank drive (because that’s what we’re really comparing; you can increase torque simply by adding more motors, but that isn’t the point of my argument). In fact, even if the wheel radius, external and internal gearing, are exactly the same on an x drive as on a tank drive, it’s possible for the x drive to have a higher MA because the MA is also determined by the angle the wheels are at.
Traditionally, x drives are considered to have their wheels facing 45° apart from the center, giving the traditional x drive an MA of 1/sqrt2 in the orthogonal directions (this is considering its from the “X” perspective, not the “+” perspective). Wheels at different angles from the origin net different MA’s. Because of this, in addition to the fact that all you have to do to change MA other than that is just change the wheel size and/or internal gearing or the motors (or add external gears, but that’s a bad idea for an x drive cuz of slop lol), x drives aren’t really lacking torque. You have a set amount of power per motor, and it’s up to you to find the optimal MA to reach your goal; same as with a tank drive (sorry for the long post on such a small statement I just enjoy x drive mechanics lol)