I generally consider “Fine” to be the +Quality, as given on CBR p24, but also a little more than that. All of the Fine items in playbooks mention being a little above and beyond. For instance, a
Fine bottle of whiskey: A rare distillation from your personal collection, potent both in its alcohol and its ability to impress. [1 load]
This is, to me, more than just “If you’re Tier 0, your whiskey is Tier 1.”
The main issue I have with 1:1 correspondence is you end up with a table that looks like this for something starting with Standard effect:
Whereas I prefer more like one of these:
This is mainly because I don’t like having vast swaths of “No effect” even for fictionally appropriate actions. I very much lean on fictional relevance as the primary anchor, then tune for tier.
Another reason is to stop someone from looking at this and going, “Oh, well the obvious thing is to pump 10 coin into crafting a Tier 8 sword/gun while the crew is Tier 1 to have extreme effect in every fight forever.”
This is, mind, more art than science - how much Quality matters doesn’t follow those charts strictly for me, because Quality becomes most relevant for actions that make it relevant. A key example of that is my Leech’s alchemicals have a Quality of the crew’s Tier, but that rarely matters because they have fixed effects that are usually only conflicted with by other alchemicals.
In short, for me, Item Quality is about resolving when two pieces of gear come into fictional conflict about which gets to impose its will on the world.