The BAF got the idea, from the IAF, infact when they were training cadets at IAF bases and say the An-32 being used in such a manner to carpet bomb with dumb munition. It makes sense, because during war, your going to use all your assets, the An-12 was used by the IAF like this against PAK on the Western border with success. It makes sense now in modern combat situations.They have other better option we use them as we don't have any other option why IAF operate them not sure but probably supplement Mig-21 in ground attack role as latter can't take more load. but now i think your SU-30 can now do the same at a time
Source: PLAAF transport bombers
to the guy who keeps on talking,
The idea of transports/bombers, isn't an old idea. Its become more usefull and relevent today, since aircraft costs are higher. B2 is a stealth bomber, with out stealth, it wouldn't be very usefull like the b-52, which is why transport aircraft, are being modified to do the same thing thse bombers did. Its about cost.
The bombers/transports have the same operating environment. And precision munition has also changed the tactics making fighters, much better bombers. Bombers, like the Bear, B.52 and H6 were designed for dumb bombs for destroying entire blocks on the ground. You can imagine with the lack of dumb munition and cost of air frames, why transports are becoming dual use.
However, that being said, supersonic/stealth bombers will be around for a while. Subsonic no stealth bombers, are seeing the door.