I think the original idea was to call it lnaddress and just use it to fetch a static file with all of your payment options, which would include lnurl. At some point it got hitched to lnurl, and I’m not take sure why. I like the idea of having a link to a static file I control with all my payment options, which may include lnurl. Tying it to lnurl or lnurlp as an options file has line of made it more confusing and I’m not sure what the rationale for it is.