I guess one more "old dog" on the pile won't hurt...lol.
The *only* thing that gets me is the idea that there must be some list of absolutes the we *all* must adhere to.
I am completely baffled by the idea that to be "pro" we ALL MUST do thus and such-even in the face of evidence that the opposite works as well or even better for *some* bands or at some *times*...
If a set setlist works in your favor for your situation-then hold to it. If a flexible setlist works in your favor then go for it. If set tempo is a band goal then dammit set your tempos in stone. If your band prefers to play a little looser then have at it...etc. etc. etc. I could go on for an hour...heads, lights, mics, volume, costumes and stage clothes....YIKES! "Auntie Em! Auntie Em!"
Sure there are some common sense aspects to this thing like knowing your part, being on time, disciplined and reliable etc. etc. etc. And sure circumstances will change based on the gig-local pub, Broadway, or in-between. Band member or hired gun? etc. etc. etc.
But within the context of full membership in a group with other musicians who the heck am I to judge whether what works for MY band will work for your band?
Anyway...thankful that this is the deepest I have to think so far today. Could be a lot worse and for some others it is a lot worse...