BB's 340 fps bow and little time to practice is classic justification for crossbow IMO for many archers. Almost any bow that is 80% letoff and 340 fps, probably has extremely low brace height (under 7" and as low as 5.5"), which makes it super critical on release, highly subject to torque and is shooting superlight arrow with light head and low FOC and an archer with a long draw in order to get that speed. In perfect world, with perfect release and perfect side vitals shot, it will kill easily but it is not a forgiving setup without a high level of proficiancy, which BB has from what he has posted. If you have all those, then no issues, but that is hard for most bowhunters to maintain that level of proficiancy and to take only those type shots.
Not meaning to quibble over technical details when I agree with the overall content.
I would just mention that PSE asked bowhunters what they wanted in a bow and they said they wanted forgiveness so PSE built a 348 FPS bow with a 8.5 inch brace height and 80% letoff. Apparently, I was the only person who thought that it was a great bow and actually bought one. PSE discontinued it the next year due to poor sales.