I do not need more power than 50 hp with a bike weight of around 180 kg. I'm also "wearing" substantial weight and never looked for a more powerful bike, even if it's heavily loaded. Before i bought my 660 Tenere i also did a test drive on a BMW F800 GS and found those extra hp to be quiet unimpressive - as the whole bike itself, but that's another story.
The 660 Tenere is about the bike i always dreamed of in north- and south-america: Not too much weight (I even bought a BMW G650 Xchallenge because of it's 140kg, but found it not so good for traveling), a huge gas-tank with very little consuming and not too fancy, but therefore more reliable/maintainable, technique. The Yamaha boys even put a 12V wire ready for being used as car-plug in their wiring! Unthinkable for a BMW (but available as expensive add on)
If now the Tenere could also use tubeless tyres i would have bought one in spare...

It's the driver that makes the difference!
Eventually you will have to pick this heavy beast up once or twice.
Good friends will wait for you, no matter how many hp your bike has.

(F**k, it's snowing like hell again. Enjoy africa)