If you happen to read any of the articles I referred to, you will see that there is a lot of ground covered, not just resolution. I don't know exactly which posting you are referring to, there was a posting indicating that the poster regarded it necessary to invest in high end MF to replace Pentax 67 equipment. I have also Pentax 67 equipment which I replaced with DSLR.
The poster I was responding to indicated that he prints up to 6 feet wide. Resolution is quite interesting in that context.
The main problems I have with film are:
1) Turnaround time, I need to send film to a pro lab
2) Scanning. It takes a long time to scan images.
3) DMAX, Velvia has a very wide density range, DMAX is about 4.0. CCD based scanners will not handle as high DMAX well. With Ektar 100 I have seen the additional problem that individual color channels may be clipped, giving weird color.
Check the enclosed image of the white wall. The Sony image has much more detail. The detail of the 6096 PPI drum scan is significantly more distinct, but the image lacks much of the fine detail.
The red flower scans lack detail compared to the digital image, in my view. On the other hand very small detail in the reds can be lost on the digital image, due to the digital image having a "Bayer filter".
In the red flower shot I had some vibration from sensor based image stabilization. I have noticed it after high res scans of film were made. The "marble statue" images have no vibration issues, but in that case I have no 6096PPI drum scan.
There are other considerations besides resolution, which has been covered elsewhere in this forum.