I don’t think anyone would disagree in principle with that - but even left in D the gearbox will work out and select a suitable gear for the terrain, weight and commanded throttle. You will get a faster responses to increases in gradient whilst in S but the price of that will be increased fuel consumption overall.
What the manual is telling you is not to use geartronic to hold the gearbox in too high a gear for the conditions.
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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