Dude, there two types of strength we can argue about; the physiological muscle force that can be counted by your methods AND there is the actual strength person has and can create when performing different lifts and motions where maximum force output is needed, thats what im talking about...
And when talking about this practical strength, we need to remember that human body is a combination of many types of different organs, fibers, bones etc...And theres no situation where the whole effectiveness of ones can action is based only on muscles...or tendons, for instance. Human body acts as a whole...and its always the weakest link that defines the result...and usual case that weaket link is meant to be muscles, if it was otherwise injuries would occur a lot more often...but when you as a bodybuilder increase the size of your muscles, there is a certain point where the force your sarcomeries can generate exceeds the strength of your tendons...In that case mucles aren the weakest link anymore...only improving their effectiveness doesnt lead to greater practical strength...most serious bodybuilders are in that situation