Legacy mode

[Rémi Forax]

Hi everybody,
I've found a document describing how the legacy mode works
so I'm able to understand if this

I have two libraries lib1and lib2 and an application app.
The application module declare a dependency to
the lib1 module and another to the lib2 module,
lib2 also declares a dependency to lib1.

Now, a new incompatible version of lib1 is created,
and the app is updated to use this new version.
lib2 is not updated and still use the old version.

So in the module repository, there are two versions
of lib1.

Is there a problem if I run my application in legacy mode ?

Rémi