Might just be a British thing? On the continent you have tabs for just beers as a matter of course. It works very well.
It's not something I've ever enjoyed, personally.
I don't mind table service being a thing, it's pretty much essentially with outdoor seating abroad, but I really don't like tabs.
Waiting ages to pay for my food and/or drinks when I've finished because they're busy, or finding out it's a lot more than expected, and the pressure to tip regardless of your enjoyment of the meal.
It's obviously not their fault, it's the system, but I'm not a fan.