Yes, it could just be "Hi there, you're using a formula depending on another formula. Do you want to add a check on these rows?" If the user elects to add a ch

Yes, it could just be "Hi there, you're using a formula depending on another formula. Do you want to add a check on these rows?" If the user elects to add a check, then expand on constraints and such. If the user selects no, remind the next user that "inadvertent modifications could result in indeterminate results." Eventually, someone receiving the attachment enables it, and a discussion starts for the group as a whole. One camp may deride the change: it will never be useful, and data is always in bounds. The other may point out some assumptions that were unclear, and now a check exists. Adding it cost nearly nothing, but coverage reduces chances of regression.