You can 'try' to make changes to any field, but when you 'save', you get a message at the top stating that Birth or Death Date is needed and you 'can not' actually save the profile unless you add a birth or death date. If you fill in a birth or death date, then try saving the changes, it will work. It is a new change in the last week, which is why there have been a couple of questions about it.
Until they stopped the Gedcom profiles from being created with no dates, they couldn't 'require' a date on all profiles. Gedcom update was done this week, so now they could implement this final change.