I think you are talking about something completely different. That, or you are delusional. Real Golf is far more difficult than disc golf. This has nothing to do with course design. The inherent difficulty of real Golf is in the difficulty of just hitting the ball. Just coordinating contact between the clubface and the ball is a barrier to entry that prevents many people from ever moving past the "I tried to hit a golf ball and couldn't stage." Anyone without a physical handicap that doesn't prevent them from throwing a disc can play disc golf.
So real Golf isn't harder, it's just that disc golf is easier? I'm going to have to pick "delusional."
De, de, definitely delusional.
Let's play which is harder. Hitting a ball with a stick or throwing a disc down a six foot wide corridor for 200 feet. Hitting a ball with a stick or throwing a disc down a five foot wide corridor for 200 feet. Hitting a ball with a stick or throwing a disc down a four foot wide corridor for 200 feet.
I can go at this all day.
You can narrow the parameters on any sport to make it more or less difficult. The distance from the pitching mound to home plate and the height of the mound have been modified many times to find the optimal balance to create a battle between the hitter and the pitcher, as opposed to a hit or pitch fest.
Disc golf is now in this position. We can balance course and hole structure to raise or lower difficulty to the level we want. Is it practical to do that in a planned way right now? Nope. But it's happening anyway in tournaments all over, as TDs and designers modify and tweak their courses.
So yes, inherently, hitting a ball with a stick is harder than throwing a disc. And if that were the only parameter, the only measure of difficulty, you'd be correct. But it isn't. Rgolf doesn't say, "okay, if you hit that ball with the stick, you've scored. The player with the most hits wins." They add in all kinds of things, doglegs, putting greens - fast and sloped, distance etc. Those things are added to bring a different level of control to the hit ball with stick idea.
So, throwing that disc tis easy. Therefore, to add difficulty, we need to tweak other things. Can you balance those other things against stick contact with ball? Yep. Can you inherently make ball golf harder than disc golf if you toughen everything up? Yep. Stick on ball is harder. But they don't do that. They are balancing difficulty to make the sport interesting for players and fans. We don't need to make other non-throwing things so hard that only a Paul or Ricky can succeed either. But not acknowledging that the difficulty can be modified to any level we want is....