I don't think you need a substantial (or integral) bolster as the weapon gets longer and heavier. Among yataghan-like weapons, the heavier ones are more likely to have an integral bolster, but I think that's because they have heavier hilts and thicker blades at the base. That is, the extra weight follows from having the integral bolster, rather than the other way around.
The meeting of tang and blade is a potential weak point, and blades do break there. A blade with an integral bolster is less likely to break there. If the integral-bolster heavy-bladed weapons are used as weapon/tools like khukuri, then it might be important for strength. If it's a "pure" weapon, less important.
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