Using data dictionary in PL/SQL

Question

What people think about using data dictionary in PL/SQL witch supposed to be used for a long time (selects, type declarations and so on)?
Oracle does not guarantee data dictionary names will be same forever.
Is it a good idea to restrict the using of this in the Development standards?

Answer 1

The reason I open this thread I am trying to improve the Development Standards
My attempt was to restrict using SELECT FROM Data Dictionary if it is possible.
Here are examples, what I trying to figure out
SELECT SYS_CONTEXT ('USERENV', 'DB_NAME')
  FROM DUAL;
or
SELECT VALUE
  FROM gv$parameter
WHERE NAME = 'db_name';
SELECT SYS_CONTEXT ('USERENV', 'CURRENT_SCHEMAID')
  FROM DUAL;
or
SELECT user#
  FROM SYS.user$
WHERE NAME = USER;
I am not asking ‘Can I...?’ I am asking ‘What people think?’
Probably, it is not an issue.