When To Use Fully Qualified Names ([database].[schema].object)

I wihsh to discuss whether to use fully qualified names:
[database].[schema].object
of objects to operate (create, query..) on is good or not?

If someone change order of sql code blocks in my script - this may cause
lose of it's context (like: use master / use <mydb>..). I wish to have my
sript independed on changes like this and always produce correct result.


Does using full name make use of 'use <db>' statement unnecessary?