Warning .... some satire follows.
SRWs are just as stable as DRWs and brake just as well. Springs are the same as well. That's why the DRWs have more payload. You could get the same payload by doing a second tire on each side with a kit. You can ignore everything but the tires/wheels.
There are no brake differences. Brakes are just discs and pads. It doesn't matter that DRWs don't usually have the same calipers as SRWs. Calipers don't matter. DRWs also are rated to tow more even though the brakes are identical.
The disc diameter is different on F450s and up compared to SRWs. Doesn't make any difference. They might use the same brake pads.
No satire follows ...
There could be a conspiracy to convince people to buy DRWs. Or, there may be something to the differences since so many people can tell the difference and note it.
Finally, buy what you want, but don't make things up to try to justify your reasoning. There are good reasons to buy a SRW just like there are good reasons to buy a DRW. YMMV.