Unique[] symbol not properly tracked

Question

In a nutshell, why does this work (change y and see how the value updates)

ClearAll[y];
Dynamic[x,
 Initialization :> (x = Symbol["y"])]

and then on a separate cell

y = 98;

but this doesn't? (assign the printed variable whatever value and see how it doesn't update)

Dynamic[x,
 Initialization :> (x = Unique[])]

You can also write Dynamic[the printed var] in a separate cell and see how it doesn't update either.

For now, I'll be using something that works and I would have never thought I would be using

Dynamic[x,
 Initialization :> (x = (Remove[#]; Symbol[#]) &@ToString@Unique[])]

My current weird conclusion: "If a variable was declared by Unique[] inside a Dynamic update, then it will never be tracked by any Dynamic "

Answer 1

I attempted this

With[{z = Unique[]}, Dynamic[w, Initialization :> (w = z)]]

and it prints \$nnn for some nnn. Then if you update the var \$nnn in other cell it gets updated. This may be a better code that the one you found.

I thought about why, but couldn't explain it. It seems Dynamic understands Symbol but doesn't understand Unique. The introduction of With seems to solve the shortcoming in Dynamic and I was speculating about a syntactic construct there but deleted my reply as it doesn't explain why Dynamic still works with Symbol.

Anyway, hope helps.