I can see you point of view but really wireless red-stone makes many things possible that would be fairly huge and confusing without it.
I do not disagree that wireless simplifies builds. For using it for true wireless stuff I am not that upset (e.g., portal frame trigger). But, what a lot of people use it for is just to not run wires, or to avoid using one of the variety of vanilla wire bridging strategies. I know it's not rational and not even consistent, but I think the constraints and capabilities of redstone in 1.5 are beautiful and I watch people like Mumbo Jumbo make them sing with a mixture of jealousy and awe.
It is not like remote red stone is not possable without it. An enderchest set next to a BC gate to send a redstone signal when there is something in it does the same function with 2 blocks instead one 1.
Yes, but that is not vanilla at all. Default Ender chests don't work with comparators. There are actually other tricks as well, including using gates on tesseracts and exploiting the buffering, or chaining block updates via BUDs.
So again how is Wireless restone OP?
It's arguable that item teleportation is itself OP in the original minecraft as conceived, but it ends up being necessary because the simulation really isn't amenable to minecarts.
I actually think maybe it's not OP, just artless and graceless. A brute force solution when an elegant one exists. And it has its place, but its place is all-too-often "how can I avoid knowing about how redstone actually works and just treat it like a dumb binary signal." It rubs me the wrong way.
And actually, here's the weird part... in terms of what's possible in 1.5, in many cases existing systems are a bit
underpowered compared to what Vanilla 1.5 is actually capable of.