I saw your idea, and I have to say, I really like it! I happen to find the moment when a redstone block locks the piston quite annoying as well! Also, I made a texture for the "Redstone Director". (To avoid confusion, I made a texture comparison of the Redstone Director vs. the normal Redstone block.)
Normal Redstone Block
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Minecraft is not medieval-themed!!! As a matter of fact, it doesn't have a set time. And when and WHY did putting reponses in the quote, especially long ones, become a trend in the Suggestions? It's rather inconvenient, mainly since the OP has to gather your quote up manually. Avatar made by Endergirl!
As far as Pistons go: you could always consider placing a slime block in between. Furthermore, there are way easier and cheaper methods to transferring redstone signals upwards and BUDs, well, I'm not sure how I feel about those being legitimized. So, sorry, I'm not seeing the added value here.
The problem with that is, now you've got a circuit that requires four vertical spaces instead of three, and a BUD that triggers the moment that something gets near it.
There's also the issue with the Slime Block grabbing anything that isn't Obsidian near it, so it definitely isn't tile-able either.
Plus, you can't put any wire within two blocks of it or else this happens:
Besides that, BUDs and transferring signals upwards are not the only things that the RDS can be used for.
A mobile diode, as odd the name sounds, can be extremely useful in any Piston-based circuit.
In this example, it's very difficult to place multiple Pistons next to each other without triggering. The Redstone Block keeps powering them, leading to issues.
A more common problem. Vertical power lock pops up pretty often. At this point, it's something you're forced to work around.
1. Pistons are used for things like Monostable circuits, something that Torches aren't ideal for.
2. It wouldn't complicate anything. This isn't a replacement for the Redstone Block, it's an additional block of its own.
3. It applies to any of the wire connected to it. That's the problem. If that wire gets updated in any way at all, it triggers the Piston. It's definitely something that can't easily be worked around.
5. Slime Blocks would drag away the Block of Redstone from the middle Piston.
6. The Director is supposed to address issues with quasi-connectivity, not necessarily just Redstone Blocks. The Repeater is powering the block lifted by the Piston, but due to quasi-connectivity, it gets locked. In the case of the RSD, it wouldn't output downwards, so it would prevent a power lock while still providing a source of power.