If you want reasons to go against DPO I’m no help but I have to say, I really, really dig my DPO. I was having problems justifying one too, but bit the bullet and it’s great. I love the sound, but even bigger reason for me is ergonomics and ease of patching. Two fully featured single oscillators, bunch of utilities and waveshaper would be more flexible than dedicated complex oscillator, but especially with the built-in attenuators/attenuverters of DPO it’s super simple and quick to patch, and easy to tweak, because very complex timbres can be made with just few patch cables, and the internal architecture and layout makes a lot of sense, at least to me. I like to think it as an instrument inside an instrument, it’s a piece that makes sound and works cleverly internally, so it’s fine I lose some flexibility compared to building equivalent thing from it’s pieces.
But, I have to say, follow is not more than simple slew between the oscillator pitches. The sync sounds heavenly, though.