Okay so what's the point?
U stated that despite the katsuyu's being split up it still survived st, but since splitting up doesn't effect durability. Why wouldn't they? They're just as durable as the original by feats and hype. Effectively meaning that whole post pointless unreasonable wank on your part.
Ot: we know three things about yin seal users.
A) the healing(despite being fast) isn't instant.
B) just because they heal that doesn't mean they don't feel pain
C) they fight recklessly, taking advantage of their healing abilities.
With all that taken into consideration, unless sakura's pain threshold is unreasonably high, she'll:
A) feel the pain from hinata's invisible attacks each time she gets hit.
B) be at the very least dazed by it. (Tsunade was on her knees coughing up blood after pulling out susanno sword, and was wincing when she swatted maddy's fireballs.) Leaving herself open for follow ups.
That being said. Since she doesn't heal/forget/stop feeling the pain it can accumulate/cause mental damage(tsukuyomi in a nutshell but watch ppl say I'm reaching) which at the very least can effect sakura's fighting capability.
While nothing in sakura's arsenal gets past hinata's cloak which at the bare minimum tripled her chakra levels.