Not to answer for Dave, but tastes vary. I quite like the look and I understand it as UA has an "analog-vibe, print to tape" type philosophy. It shows up in everything they do.
And as far as tweaking, I was an assistant for some very good engineers back in the day (80's) and I can tell you one thing, in terms of outboard gear such as compressors, limiters, and gates during the recording phase, these guys had their proven settings. Patch it, 10 seconds max putting the knobs where they knew they wanted them and on with the session. There was little to no tweaking after that unless a signal was unexpectedly hot or some such. Note that they were not used as FX during recording, just a means to get rid of noise, keep the signal from overloading, and otherwise get a clean, solid track that was easy to mix later. Of course, experience had taught them the settings and tricks.
But the point is, they had their proven presets and didn't spend a lot of time dicking around. It wasn't necessary, and it looked bad in front of producers and the like. Presets aren't bad, if they're good... LOL.
Mixing is a whole other ballgame, but the Volt effects aren't/can't be used for mixing unless you want to loop them in. I know there's always interest in something new, but these interfaces are very much meant for users who want to get nice tracks in a hurry without the aid of an engineer. I still haven't received a unit, so I can't vouch for how successful they are at this. ;-)