With active management (population mgt , water quality mgt , feeding/fertility mgt ) most things are possible in small ponds. The exception is to many fish above carrying capacity as that can wreck havoc even with active management. Without active management things can go wrong very quickly and can be fixed quickly in a small pond. There are lots of examples of poor GSF dominated ponds which are unmanaged. Same for BG and PS. I have not seen a report of overcrowded WM nor RES. You can't lump them all together. One thing to note. Some aspects of fish mgt requires room or space not available in small ponds. Some species that normally do well together in big lakes don't do well in ponds because they are crowded together without enough room. It is not always a function of food and recruitment.

You have to distinguish between advice/recommendations provided to active pond managers (many here) and to the average pond owner (little or short term management). The standard studies/recommendations provided by fisheries agencies and most pond mgt companies are for the average pond owner not the active managers. The pond mgt companies will help with non standard methods if asked and several are doing cutting edge stuff with ponds.