I see this as one of those mechanics that's aimed at helping new people get into the series.
Imo it will most likely be more dps, or at least more versatile, to not have your shots locked onto a single body part.
I'm not sure how much the weak point gameplay will even come in as in rise I didn't even really use my silkhind attacks that much. I'm aware they were overpowered but that wasn't really how I wanted to play, so I just didn't use them.
At the end of the day the thing I love most about monster hunter is that while there is a meta, there isn't a huge part of the community that clings to it. As long as you are pulling your weight for the most part it doesn't matter what you use or what you wear.
I have never been a try hard in any game, let alone MH. But I am immediately turned off by the tracer and auto-targeting focus mode stuff. They just keep messing with my bow too much in these mainline titles for personal taste.
The only homing projectiles are from focus mode. With focus mode, you literally opt in to mess up with your bow, and it wouldn't make sense to focus head and shoot forearm, for example.