notmuch is limited to a single local mail store, right?

[myglc2 <myglc2@gmail.com>]

After more flailing than I care to admit I have notmuch working with
nnir so that I can do 'G G' on a maildir folder populated/syncronized
by, for example, mbsync. Pretty, pretty, pretty nice!

In the process of getting this working, I discovered that, to use
notmuch, you must first consolidate all your mail under a single
directory which also holds the '.nogmuch' index folder.

Why? Because (according to the notmuch man page) '.notmuch-config'
specifies a single 'database.path' to maildir (as opposed to a list of
paths) and 'nnir-notmuch-remove-prefix' is a global variable.

I found it confusing that gnus lets you have multiple maildir folders
fronted by multiple nnmaildir "servers" but nnir + notmuch can search
only one. Or, in other words, 'G G' will work on one maildir group but
fail on the others.

So, now I'm guessing, "I am probably the only one who thinks multiple
maildirs are cool."

Anyway, I can work with this but I would like to check, does my
understanding sound correct to others?

If so, Do you think the gnus doc should clarify the point, and,
where/how would I suggest such a change?

Many thanks, George