[ppml] alternative to 2005-1

I'm somewhat confused by this discussion:

Is the intent to also disallow site multihoming using PA space?

If I can obtain a /48 from one provider, and also announce it
through one or more other providers, doesn't it use that same
"routing slot" a PI assignment would use?  If so, then why
is this better than a PI assignment?

If I can't do that, then it effectively prevents me from
multihoming at all, which prevents me from using IPv6 in
any meaningful way.