In my experience relating to in house, pigeon holing people into overly specific roles isn't the best way to go about things. Projects turn into an 'all hands on deck' scenario more often than not and you'll probably find the '3D modeller' (who will likely not exist as architects do the modelling) will become 'the photoshop guy' when it all hits the fan and you need to bang out 5 additional colour options for the cladding at 5:55pm.
Having titles that relate to seniority are useful as people know where they stand while showing a clear path for progression. Having titles that specify one role will likely end up not working out in house, also, unlike the VFX industry, arch vis requires a more generalist role. We had a couple of senior guys, with different specialties, animation, motion graphics whatever... and then a few mids and juniors with the same under us. Their specialities were never listed in their title and this encouraged flexibility, which is useful for personal progression and ultimately the company.