House's "huge" 11 point game in the opener was the first time he's scored in double digits against the Warriors since they became contenders. Yes, Parker hasn't done much over that time frame as well, but even so, he still performs better than House. And considering that Parker is taller than 5'8" and has penetration ability, he's the much better option.
No team wins today without at least good PG play today. That's why I'm putting "importance" on it. LMA and Kawhi both play what some would call "out-dated" styles of offense, focused on posting up and mid range shooting, both of which have comparatively low PPS averages to the style of basketball someone like James Harden or KD plays. To offset any potential problems that style might create, the Spurs need a player who can break the defense down consistently off the dribble and finish with a high percentage shot or create open shots (preferably 3 pointers) for others. Parker is really the only player on the roster who can do such. Manu is too old and TO prone. And Mills, as has been said a million times, isn't a PG.
I'll say it again. Those with a hard on for Mills as a starter need to pe ion Pop and tell him to find a playmaking SG who isn't 60 to start with him.