The speed of the reel, most of them have a high IPT.
Raul, is it fair to say that that's only a disadvantage if the angler wants a slow-moving bait? And a disadvantage with baitcasters with low IPT if the angler wants a fast retrieve?
I use spinning equipment and fish cranks a lot and there's no problem at all that I can see.
Nope, the disadvantage comes with deep and extra deep divers, they just don 't like being reeled in at high speed, some offer such high resistance that it feels like you are reeling in a bucket, others when retrieved at high speeds roll on their side and don 't work at all.