MCing isn't essential for me but I love it on funky even in full-on Petchy mode. I guess because funky always remains so danceable that I don't actually associate it entirely with grime, which had abandoned anything so danceable by the end of 2002.
I said this on the same topic on ILM:
I don't think that funky is turning into grime exactly - though certainly it is like grime in some senses. But I think the better comparison point (which Siah hints at) is dancehall - its balance between dancing and "rapping" (and a sing-songy quality equally drawn from populist dance and R&B) feels persistent in the same way that it does in dancehall, like there's some secret emulsifying ingredient that keeps these qualities in co-existent suspension rather than passing into conflict with one another.
One way of measuring the difference is in the (again, the word seems appropriate) persistent danceability of funky. In terms of garage's transformation into grime, and more precisely the shift from productions/DJs to MCs, the writing ought to have been on the wall way back with "Pulse X", which was danceable but only incidentally and fitfully so. By contrast funky has created a vital role for MCs while never retreating from its status as dance music (although certainly it has retreated from its status as house music, albeit in an asymmetrical manner), and this translates into the approach of MCs. On the DJ Petchy 23 March set just posted on Dissensus (I'll copy the link here) there's a real sense of party time jollity and fun that existed in garage only fleetingly. Whereas in garage that moment was only a transitional side-effect, in funky this is central and crucial.
Perhaps each genre in this process of development partially learns from the "mistakes" of its forebears, in turn opening itself up to new risks-of-sudden-transformation. Garage was wise to the risk of over-abstraction by watching what happened to jungle (though this trend later reared its head in the guise of dubstep) but was caught instead by hip hop's gravitational pull (in the form of grime). I have a strong suspicion that if funky rapidly transforms into something else, it won't be grime mark II, but something else and relatively unexpected.
Of course dancehall, which feels like it's at the centre of all these sounds (jungle, garage, grime, funky), is always a benevolent force on all these styles, IMO.