Since junction point is not defined in article 100, I think we need to look at the common meaning of those words. I looked in two dictionaries in the office and came up with:
Quote
1. a joining or being joined
2. place where things join

It sounds like the coupling we're talking about meets this difinition of a "junction point". But (and this is where it gets interesting) so do all of the couplings in a run of EMT for example!

I guess I can't really see any reason to treat a straight through coupling between EMT and some other raceway differently than the couplings in a run of EMT and I'm not ready to start requiring those to remain accessible [Linked Image]

I'll have to agree that the only time it makes sense to apply 300.15(F) would be at a cable/raceway transition. Looks like maybe a code change proposal is in order.