this is a topic for which many will reply ...... since 1837 the rules for certs changed considerably......
one example of this was found on an army file of one of my kin whereas he was discharged for not having his birth certificate or any school certificates. It was odd because nobody had bothered to ask him 20 years prior when he joined the army.....
then another example is that one could not get buried without a certificate, whereas in earlier times a person could swear out an avadivit and the soul would be buried in their woolens...
usually marriages required a cooling period ie the banns,so that some moderate checking could be done to see if both parties were able to get married in the first instance..... or the licence was issued by the diocesan bishop etc etc etc....
of the last few years my family who have moved considerably unearthed a box of certificates dating back to the 1880s of various kin so yes they did keep them and some do end up in divorce or probate files of the courts or where evers..... part of rootschat does have unwanted certificates that people have acquired for one reason or another, but generally after a person died personal papers to some extent were distroyed so stop or minimise fraud....... there are a million tales in the naked city .... and i guess every person could tell you a little different as to heirlooms such as certificates...