Earlier quoted context omitted.
> Why is that horrendous? Hmm. Imagine that you never had to consider any kind of unstated, fuzzy mathematical wrangling at restaurants, hairdressers, hotels, in taxis, at stores, etc - your entire life every financial transaction was straightforward. If you came from that environment, this arrangement would seem horrendous (and annoying). I understand that there's some cultural exceptionalism involved - there always…
Calculating 10% ain't that hard killer -- just move the decimal point over. 36.22 becomes 3.6. Multiply that by 2, round up/down as you feel is warranted, and go with it. Plenty of the card readers even offer pre-calculated options when paying with debit/credit (usually 15%, 18%, and 20%). If that's too difficult, horrendous, and annoying to do then chances are you shouldn't be eating out in the first place.
My point remains that forcing everyone to consider a tip of varying amounts in a wide range of social / fiscal interactions, is a needless cognitive burden.
Approximately 95% of the planet gets by somewhere between 'just fine' and 'much better' without it.