I'd say the IQ3 100MP is a bit worse than the IQ180 concerning movements if you measure it, but in practice the huge DR of the IQ3 100MP masks the problems a bit of it so they're probably quite similar. If you're not worried about tonality you can apply plenty movements.
The Rodenstocks are designed with the Dalsa 6um, ie 60MP backs, as their limit. With those you can move around anywhere in the image circle and get predictable performance. With the exception of tiling and microlens ripple, which fortunately in most cases is cleaned up well after C1's LCC algorithm, or my own I made for Lumariver HDR. I don't think Phocus is as good at it, so if one would be using a H4D-60 there would be more problems.
With the 80MP you get a bit past the limit, meaning crosstalk (mixing of the color channels) so you need to start compromising either with movements or with tonality, same with the 100MP. On the other hand, few if any will notice.
If you're only going to shoot center frames I'd drop the tech cam and go for an SLR like the XF. Even with center frames the widest do suffer some slight tonality issues and I'd choose rock-solid tonality over slight pixel peep sharpness any day, with the added bonus no LCC needed.
For me tech cams is movements, resolving power is secondary. The moment I stop using movements I stop using tech cams. Although I certainly agree that movements is more needed in architecture than in landscape, it does depend on your shooting style. I quite often apply up to 15mm movements with my SK47XL for landscape shots. Sure I can tilt the camera more and it doesn't look outright wrong like leaning buildings, but that extra subtle "large format style" strictness in perspective is a key aspect of what makes images from tech cameras special if you ask me. Distortion-free lenses also add to that strictness I desire, so no surprise I've stayed at the 50MP Kodak with symmetric Digitars.
Unfortunately the later gear is only a transportation towards the inevitable endpoint -- shooting center frames only.
I'm a dinosaur using a dinosaur camera though, I know that. Consider what serves your personal shooting style the best, and carefully consider which aspects of performance that are important to you. For example if you choose an 80MP over a 60MP for the sake of tonality, consider that if you apply movements that 80MP sensor will at some point get worse tonality than the 60MP.