Or as my Thai lady would say "tomorrow I go to shop".

As I got a better understanding of why she spoke that way, because there weren't those structures in her native language, it made me do a lot of hard thinking about English and left me with a lot of unanswered questions, but tenses are useful. "l will be going to the barbers while I'm in town" – that's compact and informative and I'd like to know how a Thai speaker would render that.

Incidentally redundancy serves a useful purpose of error detection and rectification, just as much in human speech as in RAM.