Sure, I'll try. I can't say too much as the situation as it's painful. The Executrix is actually a relative of ours that was taken in way back when and continued to reside there. Has nothing to do with my mom as they were already divorced, but my mother absolutely despised the relative and kept talking about it all the way until her dementia got worse. Anyway, it's a good idea just to know your state's rules on how things pass upon death with a will or not. If there had not been a will, everything would have passed intestate. I have heard what you mentioned about on documents such as a beneficiary, POD, etc. There were just not any done on any accounts.
For our accounts, where possible I do plan to have beneficiary forms with accounts, or PODs if you will. I do have it set with our Vanguard and IRAs, so I feel relatively comfortable with those. It currently matches the will we have. The banking does not, I have to look at that a little closer I think it involves calling and asking, as it's not online with our banks, the forms to complete, I mean.