[K Peculier]

At the start of my roleplaying journey I already leaned towards the side of being an "actor" as you put it, mainly because it's fun to use the mechanics and already using the established setting of the narrative to improv-plot out a narrative, especially when meeting new players and their characters completely blind for the first time.

I can see tons of merit of the "writer" style, but it boils down a lot to both parties agreeing to set up their interactions in such a way in order for both sides to go home happy. Otherwise you might run into the problem of having the whole narrative being shifted to cater to the writer versus having stuff play out more naturally, even if it might mean a more negative outcome for one side narratively.

Focusing more on a fulfilling narrative that can be fulfilled by both sides of a story is well and dandy, but it kind of drains the magic of roleplaying in a multiplayer game and having unique and unexpected encounters with other souls and not knowing what to immediately expect from people. At least for me.

Although the main downside of the 'style' of being the actor is that not everyone has the most noble of intentions and it can boil down to a one-sided beatdown in the name of mechanics which can be a detrimental shame if you were trying to be antagonistic in nature as a character.