agreed. the ASA classification is almost completely worthless, imho, especially in trauma. in general, there is a lot of interevaluator AND intraevaluator variability (and studies have repeatedly demonstrated this).
ASA classification has to do solely with the patient's background and underlying physical status and pre-morbid condition. for example, an otherwise healthy 25-year-old with a huge isolated tumor in their belly coming in for removal is still an ASA 1 if they do not have any other functional limitations based upon their physiology. if they are, otoh, a 25-year-old with DM1, HTN, severe CHF, and severe persistent asthma coming in for a bunionectomy under regional and MAC, they'd be an ASA 4 in my book.
the ASA classification is intended to provide a predictive value in the likelihood that a patient will suffer morbidity/mortality secondary to the anesthetic. nothing more. and, imho, it is so woefully misunderstood and misused by ancillary staff, and even many anesthesia attendings, that it is of little value. i mean, what's the real difference between an ASA 2 with an acute exacerbation and a stable ASA 3? as near as i can tell, no study has been able to answer that question either.