Although the math technically correct, it could be more accurate. It won’t calculate to certain decimals of an angle, rather the nearest whole number. Meaning you have to go pretty far between eye throws to get an accurate reading. (Generally about 100-200 blocks) However, speed runners who use this would likely want to go about 20 blocks between throws to measure. But with this you have a chance to be up to 50 blocks off at that tight of an angle. Other features such as history, Nether coords, and a faster way to reset the numbers (rather than manually deleting the numbers) would be helpful but not necessarily required. In the end this would be fine in a casual survival play through, but not super effective in speedrunning.