Maybe you are more of a shotmaker, but Nadal is more of a strategic player like myself. We strategic players prefer to play someone with lesser skills, because we know if we adjust strategy we will always win, playing talented shotmakers is always a gamble.
You probably beat those better players with pure shotmaking, while your tactics are terrible if you lose to lesser players. It's usually strategy if you lose often to lesser players.
Even when I play tough matchups, I still know that I beat them if they are worse, because I focus a lot on strategy. Last thing I need is to have better players, it's a gamble, they may have Wawrinka type days. But I never lose to worse players no matter the matchup.
You are a lazy shotmaker, you guys win on talent, so over the years you don't develop strategy. I have seen it all the time, most people love to focus just on practicing the same shots, very few people focus on strategy.
That's why I'm sure Nadal prefers lower skill players, he for sure won't lose to them.