Is there any position on which there is a universal agreement on every point among the people who subscribe to it?
Yes. All people agree on the speed of light in a vacuum, and when that value has been adjusted (which it has, several times), it is based on testable and repeatable evidence.
There is, so far as I'm aware, not a single person who claims otherwise who has been able to produce any evidence to support their differing claim.
Depends, but with other believers there's a strata which we can discuss things from.
Facts are demonstrated by producing evidence, not arrived at by means of having discussions. You make it sound like a conference, a council, or something.
Skeptics aren't intent on being skeptical? Then what makes them skeptics?
The fact that they seek more than just a claim before they'll accept something as being true.
You seem to be describing contrarians, not skeptics.
It goes hand in hand with skeptical disbelief. It's an unspoken assumption
Given that you've already demonstrated that you don't actually know what a skeptic really is, I don't think you are justified in making those kinds of assumptions.
I mean, I'd describe myself as a skeptic, and I'd be happy to accept the existence of the supernatural providing that it can be shown in some testable way.
How do you know what is real?
If it is testable in a repeatable way. If other people who have tested it get the same results as me. If it acts in a predictable and consistent manner.
What does supernatural mean? How do you define supernatural without contrasting it with natural? The issue boils down to how "natural" is defined, and its definiton is so malleable that it lacks any real meaning.
Perhaps something that exists outside our universe but is able to interact with our universe. After all, that's basically what Christians say God is, don't they? And isn't God an example of something supernatural?
Worldview beliefs can't be tested, and tend to be the dividing line between believers and disbelievers. So yeah, they make a difference.
I fear you have misunderstood the point I was making...
If a person is a Platonic realist, but then decides that they find conceptualism to be the most plausible worldview, how does their actual life change?
How about physicalism and Platonic realism? Seems a pretty important difference there. Especially when we speak of the current conversation.
Please tell me how the life of a Platonic realist is different to a Physicalist.