[strongSwan] plugins, default enabled or not

[Cindy Moore]

So I'm a little confused.  I know that there's a list of automatically
enabled options and so on, as detailed here
https://wiki.strongswan.org/projects/strongswan/wiki/PluginList


On ubuntu, the following
apt-get install strongswan strongswan-plugin-ldap strongswan-plugin-xauth-noauth

would still not enable those two options (that are listed only as s
for stable, but not E for default enabled)?  Then why even offer
those?  What am I missing here?