It is in the way you use stats to avoid the disadvantages you mention
1) if someone posts a 50% tackle efficiency in one game no need to ring the alarm bells as it could be data anomalies or problems inherent in the missed tackle percentage that you explain above. So firstly they would look to see if the low stats are repeating themselves game after game before taking notice.
2) Any one stat will probably be ignored. They should ideally have a raft of two or three statistical indicators for any dimension they wish to measure and will take the pattern of all the statistical variables into account as it is problematic to rely on just one variable like you point out with tackle efficiency stats.
3) Stats should only ever be conversation starters. OK
SJ has a winning record of 4 wins and 14 losses this year let's talk about that as a coaching staff. How much of that was on
SJ or was it the whole team? How well did
SJ play according to our observations and the eye test.
4) Stats per one of my stats professor should tell a story that makes common sense once you listen to what they say.
SJ went 4 wins and 14 losses (or whatever he actually went for) and then ask does that sound right. And yes it does make common sense as he himself said he was hampered when he was injured plus he never really got into form.
I want to pause here on one of my favourite tangents about common sense. You must use common sense correctly as a tool both in the business world, sporting world, or your personal life. Start with understanding the world based on sound values and principles or statistical data. Do not begin and end your pursuit of good decisions with what common sense tells you alone as common sense can often be wrong given the complexities of the world we live in.
Great discussion, Thanks John for kicking us off.