Janis is eternally captivating and in answer to your question, yes, this is a shameless ploy to keep viewers from drifting away.
By no means the best cut from Cheap Thrills (1968), but one of the best to capture the live vibe at The Filmore West at the peak of the Haight Ashbury days. Also, an almost documentary level visual presentation here. Love the posters! However, some of the flower power girls may be pretender models posing in a different decade? The photo texture doesn’t seem 60s to me.
One grunt from Janis is worth a thousand tortured guitar licks from Big Brother and the Holding Company. Like the 60s in general, at a certain point, you can’t say if it’s good or not. It just is. It just is what it is.