Your right. The barrier will not obscure view whilst sitting down .
However, no one will sit down during live action. You will have no option but to stand unless you're not that bothered about watching . It will only take a few to stand up , and I'm sure they will take that option if it's safe standing , and everyone will do the same.
If you are someone who has any hesitation about having to stand up during the game and would prefer to sit my advice is to move as soon as is practically possible because otherwise you will be in the wrong place.
But as has been stated, this is exactly the same as the current experience, everyone stands anyway. Anyone who doesn't want to will be moving their ST anyway, regardless of whether they install safe standing or not.
The real issue is the safe standing area is not big enough to accommodate all those who currently stand all game.