Anderton
Sanderxpander
While the visuals are nice, most of the included fx are nothing remarkable and would certainly not be preferred over top of the line third party stuff in a professional environment.
Try identical settings with the PC EQ and an EQ from another manufacturer, flip phase and do a null test, tweak the settings to get as close to a null as possible, then switch between the two EQs and see if anyone can notice a difference. It's instructive. I've done this on sessions to give the client the chance to choose whatever EQ they like best, and very few hear any difference at all. Of those who do, there's no real consistency to their choices.
One aspect I like about the PC is that I don't have to load different EQs for different colorations (or lack thereof), given the four possible modes. Also, I use the 48dB/octave high and low pass filters all the time. Before the PC EQ came along, I'd load in the Waves LinEQ filter. It's fine, of course, but it's more convenient to have everything in one place.
As a historical footnote, several years ago I did tests of the Sonitus vs the LP64 when it first came out. The LP64 hadn't been fixed so it was a real PITA to adjust, and much more time-consuming than the Sonitus. But when you compared the two, it was clear the LP64 had a more transparent high end. Pretty much anyone could hear the difference.
As I said, I actually like the EQ, and a standard per-channel EQ is common among DAWs and nice to have. Even if I need more bands from my Q10, or want to use my Waves Pulltec stuff for something specific, you can use it to roll off lows or something. But we had this before ProChannel already.
By the way, I don't care if my clients can't hear the difference between various EQs, since they're paying me to worry about that stuff. Again though, PC EQ is fine, even if stuck inside PC.
Even a simple console emulator would be ok (if NLS weren't a lot better). But my 3rd party compressors, reverbs, limiters, transient designers, delays, whatever, kick the ass of anything in the PC. CA2A is good but there's a VST version of that. I do appreciate how "quick" it works, but if the sound quality of the provided plugs is worse than what I have already, I'm still not going to use it. And yes, I hear the difference, easily. Not to mention PC isn't actually quicker if you have a long chain or need to use even one 3rd party plug in a PC bin.
In addition, I think inventing yet another standard is counter productive. I might buy your point about stability if three big issues of the latest releases hadn't been the tape sim building up hiss, the CE buzzing and the EQ spectograph failing.
Sorry, I think the PC is mostly flashy fluff. That said, it's not really "in my way" very much.