>>19411382It mucks up the comedic timing. The ternary rhythm (three-beats) is a tried and true format for delivering an effective joke, and it's written inherently right into the template for these things. Thoughtlessly tacking on additional images screw with the rhythm, ruining the sense of comedic timing.
Mind you, it is absolutely possible to break the formula and still deliver an effective piece of comedy. For example, I think
>>19400880 does it pretty well.
I also think you should avoid adding text, but I don't really have any solid reason why.