I'm taking Carsten Levin's suggestion https://community.filemaker.com/message/189446?tstart=0 and set up this thread for discussing the matter.
+1 for putting XP the list of "deprecated technologies"
+1 for bringing Win FMP' GUI to the level of OS X FMP
+1 for taking long-standing GUI bugs out of Win FMP
As an Apple subsidiary, FMI has privileged access to leading-edge GUI design knowledge and technology. Surely there are have no shortages in know-how and technical sophistication.
There may be hurdles to overcome in Windows' graphical subsystem, but all other modern Windows applications handle it very well. There are also some long-standing GUI bugs that are exclusive to the windows version, hampering usability.
Quo vadis, FMP for Win?