For once in recent times, i'm not complaining. Really looking forward to 13 now that toon is being implemented. However I will repeat, I don't think anyone wants a fully comprehensive 'toon' shader - just a better implementation of CoronaWires. Personally for me better Wires is a higher priority than faster UI. I can currently use the UI, even if it's slow, it's not stopping me doing anything, it's just making me do it slower. Not having properly behaving wires is stopping an integral part of my workflow that up until now, I've had to find shoddy workarounds for.
Whilst one of Corona's aims is photorealism, the first sentence on it's product page is this "Chaos® Corona is the only renderer created specifically for high-end architectural visualization." - so whilst Toon/Wires aren't a tool aimed at photorealism, they are an integral part of many architectural visualisation workflows. Arch Viz goes beyond realism, so in my opinion if a piece of software is dedicated to 'arch viz' then it should have all the necessary tools inside of it to cover the full arch viz pipeline.
Someone also mentioned that it isn't 'innovation' and it's merely bringing Corona up to speed. Again, personally, I'd rather be up to speed than behind.