Coming into this late to tip the balance which was 50-50 when I last looked my vote goes to the NO it’s a silly ritual camp.
Because – You get good Guinness and bad Guinness, this for me is all to do with the bar owner/man/woman.
If they take pride in their work you will see it -- clean tables, bar, toilets, décor –I could go on but we all know this equals good beer the world over. Not a silly ritual.