There are potential serious drawbacks to snubbie ported revolvers for a number of reasons. Most attacks are close in, within body contact distance.If one has to keep the gun in close to the body as is done in many circumstances, the hot blow torch gasses are being directed toward the body parts and head through the porting while the gun is firing. This causing bodily harm. Could be major harm. Especially if the head is close to the gas stream or other parts of the body are very close to the port. If unsighted and indexed fire is used the same effect as above can happen.
Then there is night vision being affected by the fireball coming out the porting. In a battle having night vision go blank or fuzzy for any period of time in low light could be fatal.Can't see the attacker clearly.
Last , but not least is the noise level is drastically amplified backward and can be debilitating or disorienting. Has happened in real cases and been documented.
Since no one can be sure exactly how a fight is going to go down or proceed, this is taking ones chances. The porting may work as advertised or make a bad situation worse.
Porting does make sense for 4 inches and longer with the more powerful cartridges. Most will be used for hunting.
Gunwriters are going back to praising porting on defensive revolvers recently. Gun Tests and Handguns had such articles.
Reality of tactics and consequences in the articles were not covered or considered.