Hmm bit of intellectual dishonesty going on here. Folks on one-hand want to factor the nuance of KW's full overseas record for 'context', while on the other hand discounting the obvious nuance that he was picked at a ridiculously young age, and that in fact his record in the last 6-7 years since the age of 23-24 (when most test batsmen debut) is amongst the top 3-4 of all time. IIRC averaging an insane 65-66 since that time, and as pointed out above, an overseas average closer to 50.
I venture to add if KW was born in Australia (as an example), he'd likely not have been good enough to push for test inclusion until around that age of 23-24, and assuming he was a mainstay in the side, he would have enjoyed the benefits of many more tests per year, higher sample sizes away & the continuity of playing the odd 4-5 test series, as opposed to inclusively 2-3.
I'd also expect him to perform on those predominately flat Australia decks (in the last 6-7 years) more like he did in the 2015 series, where he dealt with Hazel, Starc & Johnson with ease, as opposed to that series as a 21 year old in 2011 & the 2019 shocker series where he struggled with the elbow injury in 2 tests, and was injured in the 3rd test. Again horribly small sample even in Australia where he averages a more than respectable 43, when you consider it's made up of just 7 tests spanning 10 years. Context is not one-dimensional.