The oscillations occurs sometimes because the traces are too close together (I think thats basically what you're saying Ryan, so I'm reiterating that point). I know because I was designing a pedal that was very high gain with Roy from Greenhouse Pedals. I've had numerous other builders tell me that high gain can be achieved with SMD, no issues. The components are essentially the same as through hole.
Take Darkglass for instance. Doug used to make the B3K through hole, when he went SMD, there was literally no difference in sound.
You can say what you want about SMD all day, but it doesn't matter in most circuits.
Here's what I find hilarious. People are fucking OBSESSED with opening their pedals and 90% of them couldn't solder to save their life or tell you a single component in there. Now a lot of folks can, but it's become ridiculous to the point of pure stupidity. OMG there's a fucking wire that looks less than pretty or some other asinine shit that doesn't matter. Drive me bonkers and it's the reason I stopped doing rehouses that require full rewiring jobs, which trust me was most cases.
I'll take an SMD pedal any day over some shit box tube pedal or something fucking massive (unless Dan built it obviously)

That's just my thoughts.