That's because English people like to order their 4 pints of Guinness last, as an after thought, so they can moan you're rude when you start them, charge them and move on to the next person while they're settling and you're topping 🤣 people get incredibly bent out of shape ime if you haven't finished their round and start working on the next one, even if it would make no difference at all to the time they'd have to wait because Guinness takes longer.
In general, most bar staff do know who's next, I usually do unless I've had to go to the cellar or something and not actually been there, but you'll wait if:
-I've heard you bitching about the 'half an hour' (why is it always half an hour? If you're going to start with the PA remarks that you know I can hear but won't actually direct at me, then at least be original about it)
- You've been rude and obnoxious on a previous visit to the bar
- on your last round you've complained about the wait, then dither about what you want, make me recite the drinks menu, along with abv and price when it's on the bar in front of you and you've had your 'half an hour' to look
- You ordered and then trotted off to the toilet on your last trip and then expected that I won't have cleared it off the till, shoved it all on the back bar and served the next person and you'll have to wait for your drinks until I'm done with them
- you wave a card or note in my face - everyone is paying mate, you're not special
- you answer "Who's next to please?" with "Decent bar staff should know" when I've had my head in the glass washer, under the bar, just walked into serve etc.
- you ignored the 4 times I asked if you wanted ice and then made a big deal out of the fact it's on the bar in front of you without ice - easier to put it in than take it out when you deign to answer me
- you order one drink at a time whilst asking your mates what they want, with a little conversation in between, top marks if you have to keep going back to the table to ask as well and then look shocked when I ask for payment and you have to go back again to get your card & money
- you pushed in last time, or tried to
In short, know what you want, be a decent person and treat me and other customers with a bit of respect and you'll get served in your turn, no one has died from waiting a few minutes for a drink, you won't need therapy and it's not the end of the world. You've seen the scrum at the bar and decided to join it - no one's got a gun to your head.
Oh and order Guinness first!