That could lead to UX problems though. What if I meant to click on a link but missed because, assuming you style it this way, I get the cursor that represents a link on both so I couldn't tell the difference? Therefore, I would end up going to an unexpected page because the link I thought I clicked on represented something different to me than what I ended up with.
Of course, you could just give a visual feedback of what is the current link that will be followed but that might be annoying to some depending on the design.
If clicking a comment just opens a small textbox beneath the comment then it's not a big deal if they miss. But I can definitely see having different pages loaded being a problem.
But ultimately, it should not be a limitation of the technology that determines what is an isn't usable. That's a job for UX designer, and they should have every freedom with the technology to create their designs.
Although I agree that it would be best for an UX designer to make such decisions, most of the time one is not involved and there has to be some sort of limit based on some standard. If you allow potentially bad decisions, then ultimately a great deal of bad decisions will be made. For example, look at how browsers will render absolutely awful HTML soup and the state of most of the HTML out there.
