I think inheritance make code more coupled, which make it hard to delete or refactor. Most of the cases it's better to just copy and paste. You can still share methods. But the moment you need to modify a shared method just so it can be reused: Make a new function instead. One popular solution is to only let functions do one thing but that leads to even more coupling and less reuse.
There's a fine balance between reuse and coupling. Where reuse is good and coupling is bad. A general rule for when to reuse/share/modularize is when the method/function can be reused in other code base. eg. when it can be/is decoupled.
