And while you at that, why not simpl grant him DBA privilege? And perhaps SYSDBA on top of that? Or, to make it even more simple, why not simply all your user know the SYS password and let them all allways connect as SYS?
Granting select any table to a user doesn't mean one is giving all the DBA privileges to a user. One is giving just read only privilege on the v$tables.

For example:
Developer need to check how many cursors are opened by his application while running, one way is to access the corresponding v$tables to close the cursors that are open. Otherwise everytime he/she has to request the DBA to provide the respective information.

Its entirely depends upon the situation and request.

Thanks,