Maybe I can give you some guidelines for dimensioning. For some applications what you have shown can be acceptable and functional.
Some of the questions which need to be addressed are;
- How do the relationships with the mating parts effect the fit and function
- What tolerances will achieve the results without undue cost or time
- How can the dimensions / tolerance be defined to achieve the desired results.
In this case the GD&T parallel to either the O.D. or I.D., indicated by the Datum A, with an additional Datum B on one of the notched ends would constrain the notches together.
I hope this helps.