Hi, Welcome to the site, it's good to see you here.
Actually, if you think more about the way the pressure plate and the "fingers" work. It should become more clear.
They are levers and as the disc wears it becomes more narrow/thin, the lever passes over the fulcrum (pivot point) it will move a greater distance the thinner the disc becomes.

So there goes your bearing gap/clearance. I had a F-150 4x4 and when I replaced the clutch and related parts I found the internal hydraulic setup was always in contact and was actually spring loaded to keep the bearing in contact with the pressure plate. Just seemed wrong to me but it always worked well.

Hope it helps.