Shut up, dumb IGfag, and face the facts:
the fact is that Cadians DO NOT NEED to be this simple and bland. Not when GW has proven time and time again that they can easily come up with more compelling designs and that they could do so even all the way back in the 80s.
The fact is that Cadians look almost out of place in 40k, even compared to RT-era imperial army models.
The fact is that Jes Goodwin's concept arts made prior to the release of the current IG sculpts were a thousand times more characterful than what we ended up with.
The fact is that there is very little room for customization and improvement for Cadians because they all look the fucking same and look too clean and chunky to fit in with other ranges. For instance, the recent conversions we've seen that are based on Cadian bodies look worse than all the others.
And the recent artworks that show us Cadian veterans with such small alterations as rolled-up sleeves already look better than the baseline stuff.
The fact is that the generic, cheaply-produced 40k grunt doesn't have to look boring.
There is no justification for Cadians being as they are.