In regards to why some restaurants want to avoid the split check situation, they may be try to avoid either of these two scenarios I saw more than a few times when there was a huge party with separate checks:
Scenario 1: Person asks for extra naan ‘for the table’ indicating themself and a few other people. More people at the table ask for extra naan, sometimes of my coworkers rather than me. I assume it’s a table-wide thing (most of the time it is), and order more naan for the table. When it comes time for the bill, I split the naan order by the number of people who shared it (my system allowed me to divide any item but drinks).
Result: No one wants to pay for the naan, everyone blaming everyone else for ordering the naan. Or, they claim that they thought the naan was free. Either way, they make such a stink that it’s often taken off the bill.
If I try to rectify this by going to the table and asking who exactly ordered the naan when they place orders with my coworkers or only charging the people who actually ordered the naan, there is sometimes outrage that a single individual should pay for something the whole table enjoyed, but by then it’s too late to collect money from all the other people (they never offer it up).
Once I had this asshole guy who kept ordering things ‘for the table’ and no one said that it should be otherwise. He wouldn’t accept the entire bill for the extra items and the other people didn’t want to have the items on their tickets either.
Scenario 2: People deny having certain drinks/appetizers, claiming they never ordered what I charged them for or they weren’t the ones who had that particular item. I always took good notes, very carefully put the order into the kitchen to make sure all the seat numbers were right, and IDed the dish when putting it down (I worked in an Indian restaurant, sometimes they needed to hear the name again). It’s possible that I messed up a few times, but, in some of those cases, I know those people were lying. Cheapskate acquaintances who will try to cheat you into paying for their dinner will often try the same bullshit tactics on us.
Having one bill saves us this confusion. Perhaps it’s a cultural thing, but I’ve noticed in certain ethnic groups, one person always pays the bill. I loved serving parties like that where the leader was also a heavy drinker.
I’m amazed that you saw waiters/waitresses on cell phones in upscale places. We’d be fired that day if we tried something like that in my work place.