When you join this type of forum you generally have little knowledge of its workings and “atmosphere “.
Using a pseudonym is therefore often seen as a sensible choice. My favourite is “not my real name”.
With forums attached to clubs or associations then your registered (real) name is often used by default.
I use my two Christian names on another forum as well, simply leaving off the surname. I do not play on FB et al.
Knowing how much information can be gleaned from the net I am cautious that a malevolent soul, and we have had some, could cause upset for the rest of the members.
I also suspect that changing one’s name will be impossible without re-registration, so I vote for the status quo.