“I am not alway for sure that I meet the MECE requirement when developing a logic-tree”
This is a common issue for many problem-solvers.
Many of the pure “academic” people cannot solve this issue and they may not be able to reach a practical solution forever.
On the other hands, practical business person needs to conclude issues and decide which way to go.
I have the solution for such practical problem-solvers, which I teach to the students in my university business class.
There are two simple criteria as follows. If you are sure that you meet the criteria, then you may not have any practical issues even if you stop expanding logic-tree further.
This is something you cannot find in any kinds of “logical-thinking” books but you definitely need to know when facing a practical issue to solve.