Productized services are not designed to be set in stone forever.
They should be treated as fluid offers, adapting to the needs and requests of your best clients and ideal prospects.
Double emphasis on best and ideal, respectively.
They can and should change with you over time—phasing out work you no longer wish to do and becoming more valuable in other ways.
Create productized services if you wish, but be ready to change, eliminate, or/or add new offers whenever you see fit.
Follow the value, not just your ideal vision of what your services should entail.