They do in a pinch, but ever since I got my hands on some GMK caps, OEM is dead to me... 
OEM sucks, that is a fact, and facts are undisputed, you can tolerate it, live with it; if there is no option, but that does not change the simple reality.
i do prefer my step sculpture 2 over my ducky oem. but whats with all the hate on OEM? hahaha
Sometimes, I feel as though the hate is only there because of what's associated with OEM caps and not the profile itself - that they are stock, thin ABS, often printed, and sometimes have displeasing fonts. I wonder whether the hate would persist if boards came with thin Cherry profile caps as the standard and OEM profile caps were produced as thick doubleshot ABS.
FWIW, I am predominantly an Alps user and basically all available key sets, vintage or otherwise, are OEM-profile (with the exception of maybe one or two distinct keyboards with Cherry profile and vintage Apple boards).
Because good quality Alps key sets are hard to come by and often cannot be fully utilized due to wonky, often non-standard layouts, it is nice to be able to mix-and-match key sets.
I certainly agree with your point, that the actual profile is kinda irrelevant, albeit for different reasons. If Cherry or some other profile were instead standard for Alps, I think that would be my preference.
That said, I have also tried beam spring-profile sphericals and I cannot say I care for that profile very much, not sure why.
EDIT: After rereading the first few posts of this thread, I have been reminded by Jacobolus' post that Alps 'OEM' is actually its own distinct profile that is close, but not quite, to 'standard' OEM. Still, my opinion stands as long as there is uniformity among key sets I use.
