I got to agree with you for the most part.
I don’t think tackles is a great indication to judge a play of a linebacker.
It can be a pretty flawed stat as lots of tackles can be 5 to 10 yards downfield.
If there was a stat to show me tackles behind the line of scrimmage, or 2 yards or less, then that would say a lot more.
Now I have nothing to back up to say Preston browns tackles were farther downfield, but it definitely seemed like he choose the wrong gap too often, and it for sure seemed like lots of his tackles were after 5 yards.