Patricia, keep in mind that this PROPOSED policy change from optional to mandatory explanatory comments has not so far occurred. It's still a "maybe".
I'm not sure Chris specifically named BioBuilders, and I'm not sure who mentioned "frequent savers" -- we're not encouraged to point fingers of BLAME at anyone at WT which I am sure Chris knows. Personally I think this is the least attractive Suggested Improvement I have ever seen at WT.
Such a mandatory requirement on "explanatory comment before saving or no saving occurs" would impact any PM who saves frequent whether they are BioBuilders or merely being thorough in their profile creation or development (such as myself).
In the realm of cyber tech frequent saving is a survival tactic since so many things can occur that would lead to a loss of material already gathered / entered -- I could probably list nearly a 100+ events that could occur that would blow off work accomplished given the opportune moment when time and space and physics join and permit
The basic Ideal I have is to consider my options of alternative methods for creation and editing. So far the use of an outside note pad seems the most viable. In your case the use of an outside note pad and then -- after your work on the Biography is concluded -- c&p it into the profile seems suitable. You could then save as frequently as necessary.
If you have no note pad you can instead place the material into an email TO YOURSELF and still work at your leisure with frequent saves to Drafts