I used the "string tracker" a few times back in the early 80's, with good results.
Shots under 25 yards had good accuracy, even though there was a spool of line attached. I had arrows pass through and stay in, both worked well.
The last deer I killed using the string tracker did not die immediately. I sat in my stand and watched the line spool out for twenty minutes as the deer walked further and further away.
It was kinda weird to be sitting there for ten minutes, and no string spooling, thinking it was dead, only to have it all of a sudden start peeling out again.
We all learned a lot in those early years. Before TV shows, and internet, it was hard to get much information.
Several hundred kills later, I now know how dumb and inexperienced I was.
And still, deer teach me more every year.