^Right. Moreover, "episodic" and "serialized" aren't absolute categories, they're just tools in the kit, and most shows employ a mix of both approaches.
Yes the X-Files were episodic and yet the characters had arcs spanning a few episodes and other arcs spanning a whole season or 2.
ENT was episodic for season 1 & 2. Season 3 they tried a serialized type of storytelling and I thought it was fine as I only watched it on DVD and not during the initial broadcast.