I think what the previous contributors to this thread are saying, which I completely agree with, is that the stock LOD intervals are not adequate to provide usability and that ESRI needs to make changes to make them more flexible. It is so common that one click of the plus/minus controls gives too large of an extent and the next click in is too small. I typically avoid using the mouse wheel entirely because a few clicks will zoom out almost to world extent, and vice versa. The number of lines per increment of the mouse wheel is of course a system setting on Windows but changing this to make it more compatible with web maps and apps makes it pretty unworkable with all my other programs and for using the web browser. I've tried to customize zoom levels but it leads to problems in rendering tiled layers--they disappear at specific extent ranges using standard settings and creating more detailed tiled layers that work across all scale ranges either causes Pro to crash during processing or uses up too many credits to be worthwhile. I have tried all workarounds except for the custom basemaps, which seems like an over the top level of effort for something that should work out of the box. This lack of functionality in this simple action, zooming in and out, had led to problems convincing non-GIS specialists to use the apps I've created. They get discouraged at having to remember to never use their mouse wheel and frustrated when the ideal zoom for a given analysis is between two levels. I don't think there is any valid excuse for fixing this and think that many others would agree.
