Yes. See "Useless use of cat" (or "UUOC").

If you prefer to have the command arguments at the end of the line (so it's easier to amend), you can do e.g:

  < file.txt grep pattern

instead of

  grep pattern file.txt

or

  cat file.txt | grep pattern

There are also some related useless uses, like useless use of grep | awk:

  grep pattern file | awk '{print $3}'

which can instead be written as

  awk '/pattern/ {print $3}' file