Yep, it's hard work racing a maxi without powered winches - but Comanche did it when she finished second over the line in the Hobart last year. Secondly, if people don't want to handle high loads, why did they get 100 footers? Thirdly, yes, sailing a 100 footer with manual power may be hard - for the two days they take to get to Hobart. Those on the smaller boats suffer fatigue for much longer.
Some people claim that you can't sail a 100 without power but that is obviously not true - they got J Classers and even bigger schooners around short courses without manual power. Personally I'm more against powered canters, though.
At the moment, the use of power increases your rating, which is not something that the maxis care about. Let's propose a different system, where everyone gets to use the same amount of fossil fuels. If you want to run the engine to cant your keel, fine. If you want to run the engine to power your winches, fine. If you want to have a powerboat to meet you off Flinders to pass on board fresh crew and a nice meal (which, like using powered winches is just another way of using external forces to reduce fatigue), fine - and if you want to just run your main engine to power the boat through any calm patches, that's fine too.