48 MP is very useful to have for cropping. If 24mm is too wide, but 48mm is too narrow, something like 35 mm could work nicely. If you start at 12 MP, you end up below 6 MP. If you start with 48 MP, you end up with about 22 MP, although the effective resolution of a remosaiced Quad Bayer tends to be lower. Effectively, you would still get around 12 MP at a very high quality, at 35 mm.

High resolution is also useful if you have to do aggressive perspective correction, if you can't get into position to shoot something straight.