The Occam ideal is “simplest fully explanatory theory”. The reality is: sometimes you don’t have a fully explanatory theory at all, only a broken mostly-explanatory theory. Sometimes the data isn’t good enough to support any theory. Sometimes you have a theory that’s obviously overcomplicated but no idea how to simplify it. And sometimes you have a bunch of theories, no easy way to test them, and it’s not obvious which is simplest.
The Occam ideal is “simplest fully explanatory theory”. The reality is: sometimes you don’t have a fully explanatory theory at all, only a broken mostly-explanatory theory. Sometimes the data isn’t good enough to support any theory. Sometimes you have a theory that’s obviously overcomplicated but no idea how to simplify it. And sometimes you have a bunch of theories, no easy way to test them, and it’s not obvious which is simplest.