well normally yes , but in this case actual window manager already complies to the standard windows ui api, thats why it works with all other progs ... affinity seem to have build their ui with some additional libraries which conflict with actual window manager and other similar tools.
since affinity progs are compiled, affinity would need to share their sourcecode with the AWM developers, which might be problematic . or they would need to hack or emulate that, which is probably not good
of course i wrote the AWM devs too on their forum. but i think this is easier handled by the affinity team .. maybe its not possible at all , that they used a complete different ui and not the windows one