This is such a bizarre argument to make. An analog synth is typically going to be far more expressive than Pd: most if not all of its settings are immediately available via a physical knob, where with Pd you have to configure a mapping for each parameter--and by default it won't be labelled, so you have to put stickynotes all over the place, and if you change anything, move them all over again. Which you can do! But it's a lot of time spent, which you have to keep on spending as you change your Pd configuration.

But that's bracketing out the issue of the sound. Digital synths just don't sound like analog synths, not yet. (The gap is closing every year, sure.) Modelling the subtle variations of an analog synth is a difficult, processor-intensive task, and there's a qualitative difference between the sound of the best digital emulations and the cheapest analog devices. I use both digital and analog synthesizers, and I find that creating usable sounds is much faster with analog. Which translates into more expressiveness, because it's much more possible to change sounds on the fly.