yep that is tough to argue with a SR of 80 and average of 50 is better than an average of 50 and SR of 50. But generally the faster you try to bat the more risk you introduce into your game and you are more likely to get out. So in GENERAL the higher your SR is the more unreliable you will be as a batsman even though there are exceptions to the rule.
To prove my point - I looked at the batsman on that link I provided. The guys who had a SR of 60 or over had a combined average of 40.18 and the combined average of the batsman who had a SR in the 50s was 43.55 The weakness in this analysis is that I have a runs qualification of 2000 runs. If I had a lower runs qualification then the difference in averages would be even more stark.
So my first point is that in general a team with batsman with SRs of 50 will be more consistent.
My second point is having watched Viv there were plenty of times where he got 30 and out - and you just knew if he could have been more circumspect in that inning he could have tonned up - sometimes he was too dialled up and completely full of disdain to the bowling. He personally could have averaged more if he had've been able to pick and choose his moments a bit better. This a controversial point so I will qualify it with an IMHO.
You cannot take Viv's nonchalance as the template of high strike rate batsmen, getting to 30-40 and then out. Look at Sehwag. He either fails to cross 20 or scores 80+ practically everytime he's made 20+
Viv played his entire time with an ATG bowling attack. An attack that backed itself to dismiss the opposition cheaper than what they'd scored 9 times out of 10 and delivered.
Plus he batted behind the most successful opening partnership of his era. This does introduce some inherent nonchalance to his game that has little or nothing to do with his strike rate ability.
If you'd lowered the qualifications below 2000 runs, then the gap between the averages of slowpokes and hurricane scorers would actually decrease. That is because, most lower order batsmen(bowlers) have high strike rates, owing to the fact that they often get 10 off of 15 balls and then out more often than 20 off of 50 balls.
On a general spectrum, it is a no-brainer that the slower strike rate correlates with higher average for the whole field: the average batsman would be insane to try and bash balls he should be blocking simply trying to keep up with the likes of Sehwag or Warner. And when they do try, it leads to their demise because its not their natural game. But the high strike + high average guys, as rare as they are, are worth their weight in gold and for some, like Sehwag or Warner, are worth more than a batsman with slightly better averages when paired with a 'damage control slow poke' partner.